Designer and operator manual dorot

Version 200508
Automatic Control Valves USER MANUAL
DESIGNER & OPERATOR
MANUAL

TABLE OF CONTENTS
Automatic Control Valves OPERATION MANUAL Section1
Section 1, Basic Valves……………………………………………………. 3
Section 2, Automatic control valves……………………………………..... 32
Section 3, Operating instructions / trouble shooting guide………………72

BASIC VALVES
Automatic Control Valves OPERATION MANUAL Section 1
Basic valves operation….…………………………………………………...4
Basic Metal Valves – Size and Diaphragm Selection Guide…………….8
Plastic Valves………………………………………………………………..11
Plastic Valves – S-75.……………………………………………………....13
Plastic Valves – S-95, S-96…................................................................16
Plastic Valves – PVC Valves installation………………………………….18
Plastic Valves – S- 80……………………………………………………….20
Backflushing Control Valves………………………………………………..23

BASIC VALVES OPERATION
Closed valve
DIRECT-SEALING DIAPHRAGM
The direct-sealing diaphragm valves are operated by pipeline
pressure or by air pressure (which is equal to or larger than the
pipeline pressure).
The reinforced rubber diaphragm seals the water passage when
the line pressure reaches the valve’s control chamber. Relieving
the pressure from the control chamber causes the valve to open.
REINFORCED RUBBER DIAPHRAGM
The valves only moving part is its diaphragm. A spring located
above the diaphragm ensures “valve closure” regardless of
pressure level and flow conditions.
Upstream pressure applied to twice
the diaphragm area. Valve closes.
Opening port releases pressure
from inside Bonnet. Valve opens.
Open valve

HYDRAULIC Properties of water used in practical designs
Density: 1 gr/cm3
(0.036 lb/in3
)
Kinematic viscosity: 10-6
m2
/s (10.76 ft2
/sec)
Static pressure : The column of water sorted in a tank with relation to a
relative surface, or the potential energy in a pipe line.
Dynamic pressure: The energy gradient caused by flow of water.
Flow rate: The amount of water passing through a nozzle at a period of time.
Open discharge flow equation
Units US Metric
Equation 445.22
xDxVQ 4.28272
DVQ
Q = GPM
V = ft/sec
D = Diameter (ID) inch
2.445 = Unit Conversion factor
Q = m3
/h
V = m/sec
D = Diameter (m)
2827.4 = Unit Conversion factor
Valve pressure loss: The pressure differential across a valve caused by friction.
Pressure loss equation
Units US Metric
Equation 2
Cv
Q
P
2
Kv
Q
P
Q = GPM
Cv = Flow coefficient [GPM @ 1
psi pressure loss]
Q = m3
/h
KV = Flow coefficient [m3
/h @ 1
bar pressure loss]

WHAT IS A CONTROL VALVE
Control (regulating) valves are semi-automatic directional devices, which control
flow and/or pressure in a water supply network. The valves are pre-set by the
operator to the required operating parameters.
OPERATING PRESSURES FOR VALVES
The standard valves are divided into three pressure categories:
Medium pressure metallic models (up to 230 psi)
High Pressure metallic models (up to 360 psi)
Plastic valves (up to 150 psi)
OPENING PRESSURES OF VALVES
The sealing diaphragm or plug of the hydraulic control valve is pushed to open by
the pressure in the line. This pressure should be high enough to ensure the
minimal required opening force. Verify that the upstream pressure is not below
the minimal opening pressure of the valve, as defined in the technical data
supplied.
Note: Non-standard, low-pressure diaphragms can be used with Direct Sealing
Diaphragm valves (Gal) to allow lower opening pressures. These diaphragms
should not be used with regulating valves and should be preferred for onoff use
only.
OPERATING VELOCITIES FOR VALVES
Direct Sealing Diaphragm valves (Gal valves) may be used at very high flow
velocities due to the shape of the valve body, which allows smooth and wide flow
passage. The valves may be operated in the fully open position at 8 m/sec [15
ft/sec] velocity without noise, shuddering or cavitation damage for short durations
and at 5.5 m/sec [18 ft/sec] for continuous operation.
MEDIA CONTROLLED BY VALVES
The valve is suitable for controlling slurries, untreated sewage water, water with
high sand content as well as the potable water. This is due to the design of the
valve, which has no shaft, bearings, seals or discs within the water passage. The
control pressure should be the line pressure filtered to a degree of 40 mesh min.
or use a clean external pressure source such as filtered fresh water or
compressed natural gasair.
Note: In-line self-flushing filters, ensuring clog-free operation of the control devices when
operating with potable or raw irrigation water, are a standard feature on all control valves.
CONTROL MEDIA FOR VALVES
The valve can be controlled by an external source such as air or clean water in
cases where the media is very dirty or aggressive.

PRESSURE DIFFERENTIAL
High pressure differential across the regulating valve may cause severe
aberration and cavitation damage. One should avoid operating the valve for long
durations at pressure ratio exceeding 3:1 (Upstream:Downstream pressures).
Special attention should be given to maintain the operating pressures within the
specified limits.
In case such regulating conditions exist, the recommended solutions may be:
Installing two valves in sequence (inline), were each valve is operating
with just half of the total pressure differential.
Installing A fixed orifice within the pipe to reduce the regulation ratio of the
valve to the recommended 3:1 ratio. This solution is only possible when
the flow is at a constant value most of the time.
PRESSURE LOSSES WITH VALVES
As the water passes through the Gal valves is smooth and causes only minimal
obstruction, the resulting pressure-losses are typically low. Consequently, the
automatic control valve has a very high Kv [Cv] coefficient. This allows using a
valve smaller than the pipeline nominal diameter. This is not detrimental to the
system and is more economical.
Note: Kv [Cv] data refers to a fully open valve (controlled by a 3 Way Control
System were the control chamber's pressure is atmospheric). The pressure
losses in a valve controlled by a 2 Way Control System (minimal control
chamber's pressure is the downstream pressure) may be considerably higher.
CAVITATION POTENTIAL WITH VALVES
The valves unique structure makes them very resistant to cavitation. However, it
is not recommended to exceed a 3:1 ratio of Upstream/ Downstream pressures.
When higher regulation ratios are required (up to 5:1), it is recommended to use
cast bronze or non-metal (nylon/PVC) valves.
Note: Pressure Relief valves and Modulating Float controlled valves whose
downstream pressure is very low are subjected to destructive cavitation levels.
Therefore, the use of bronze valves or a proper orifice plate is essential for
prolonging their life span.
Please consult DOROT VALVES technical department for further information.
MANUAL OVERRIDE
Manual override feature (using 3-position selector ball valves) can be added to
any control application.
GENERAL INFORMATION ABOUT VALVES
DOROT VALVES broad range of specialized hydraulic control solutions, allows
us to design a solution to any control system, no matter how complicated.
Please note, we have not included our complete line of valves in this manual.
If the required control system needed does not appear here, please contact your
distributor or DOROT VALVES Technical Support department.
We will design a tailor made control valve for your system if a standard one is not
currently available.

BASIC METAL VALVES
Table 1
Table 2

Notes: 1. Pressure range- referring to upstream pressure and not to downstream regulating set-
pressure.
2. Standard and High Pressure diaphragms are suitable for regulating applications.
3. Low pressure diaphragms are suitable for on/ off applications.
Pressure rating:
100 series (GAL) valves pressure rating as marked on the valve I.D. plate refers to
body & bonnet strength and diaphragm type. It is the customer's responsibility to
define the adequate connection standard. Please consult Dorot Technical Support
department in case you require assistance in selecting the right connection
typestandard.
Pressure rating of valve body for standard models: 16 bar /230 psi
Pressure rating of valve body for high pressure models: 25 bar / 360 psi
Connection standard is marked on valves identification plate.
Diaphragm standard is specified in the above table.
Non standard bonnets:
Available on demand

Hydraulic performance
Table 4.

PLASTIC VALVES
Background
Dorot is one of the first valve companies world-wide to bring
automatic hydraulic control plastic valves to the market. It is
the first company to present large diameter plastic valves and
is currently holding an exceptionally wide range of composite
and plastic material valves that allows the user to select the
most appropriate valve for the specific system's requirement.
ADVANTAGES
Reliable control of corrosive liquids
Lightweight, cost-saving
Minimum maintenance - maximum dependability
Simple to install
APPLICATIONS
Irrigation System
Industrial usage with corrosive fluids
Sewage systems
Landscape and Greenhouse applications
Reinforced nylon
throttling 2-w electric
PVC 3-w electric
6" PVC manual
80 Series 2-w electric

PLASTIC VALVES
3 way control
The control devise (solenoid valve, pilot valves, relay valves, manual
selector valves or combination of thereof) can admit pressure into the
control chamber, causing valve closure, or relive pressure from control
chamber to the atmosphere, enabling valve opening.
2 way electric control
A permanent, constant resistance connection exists, from upstream (inlet)
to the control chamber. A solenoid operator is installed on a second
passage from the control chamber to the downstream (outlet) side of the
valve. When the solenoid is de-energized (or in closed position in latching
solenoid operators), it plugs the control chamber outlet, thus pressure
entering through the upstream passage can not escape and the valve
closes. Energizing a continuous current operated solenoid or pulsing a
latching operator to open, opens the outlet to downstream and relives
control chamber pressure which will enable the valve to open.

PLASTIC VALVES
S-75
DESCRIPTION
Direct-sealing diaphragm valves that are operated by line
pressure or by an external filtered waterair pressure
(which is equal to or higher than the line pressure).
The reinforced rubber diaphragm seals the water passage
when line pressure reaches the valve’s control chamber.
Relieving the pressure from the control chamber, to the
atmosphere or to downstream, enables the valve to open.
The valve’s only moving component is its diaphragm; no
shaft, seals, or bearings are located within the water
passage.
The valves are made of robust, high-quality composite &
plastic materials. It is produced in a number of structurally
different versions (throttling, built-in solenoid operator,
etc.), with a wide range of control and regulation functions
(manual activation, remote pressure control, pressure
reducing, etc.).
ADVANTAGES
Exceptional structural simplicity
Superb hydraulic performance
Reliable control of unfiltered irrigation water and corrosive
liquids
Lightweight, cost-saving
Minimum maintenance - maximum dependability
Simple to install
APPLICATIONS
Irrigation System
Industrial usage with corrosive fluids
Sewage systems
Landscape and Greenhouse applications
Reinforced nylon
throttling 2-w electric
75 series 3-w
electric
75 series 3-w electric
Pressure reducing

S-75, Hydraulic Performance
Valve Size ¾"20mm 1"25mm 1½"40mm 2"50mm
2½"/65mm
32380L
KV 7.5Head loss
(3-w models) CV 17.5
m
3
/hr 5Max. recommended
flow GPM 22
m
3
/hr <1
Minimal flow
GPM <5
C
0
Max. water temp.
F
0
C
0
Max. ambient temp
F
0
3-way m 9-80 10-100Pressure
range 2-way m 5-80 8-100
Head loses for 2-way and 3-way valves
2-way valves

-way valves
-way valves
1" and 3/4"

PLASTIC VALVES
S-95, S-96
DESCRIPTION
The uPVC valves, series 95 and 96 are direct sealing
diaphragm valves at diameters of 3", 4" and 6".
(90mm,110mm and 160mm)
The uPVC valves are threaded (95 model) or solvent-
welded straight to the pipe. (96 model)
The uPVC valves are designed for high flow irrigation plots
and offer excellent hydraulic performance.
The uPVC valves offer high resistance to corrosive fluids
and can be used for aggressive media conduction.
The valves are designed for underground and above
ground installation.
ADVANTAGES
Exceptional structural simplicity.
Superb hydraulic performance at high flow rates.
Reliable control of unfiltered irrigation water and
concentrated corrosive liquids.
Lightweight, cost-saving.
Minimum maintenance - maximum dependability.
Simple to install with slip or threaded PVC connections.
Suitable for subsurface installations - requires less fittings,
offers lower head losses and reduces mechanical and
weather damage hazards.
APPLICATIONS
Irrigation Systems.
Underground installation with controls at the surface.
Industrial usage with corrosive fluids.
Sewage systems.
95 series 3-way
electric pressure
reducing
95 series 3-way
electric
96 series 3-way
manual

S-95, S-96 Hydraulic Performance
Head loses for 2-way and 3-way valves
Valve Size
3" 90mm 4" 110mm 6" 160mm
KV 150Head loss
(3-w models) CV 557
m
3
/hrMax. recommended
flow GPM
m
3
/hr <1
Minimal flow
GPM <5
C
0
Max. water temp.
F
0
C
0
Max. ambient temp
F
0
Pressure range m - -

PLASTIC VALVES
uPVC Valves Assembly and Installation
THREADED VALVE
Use a Teflon tape or Teflon sealer compound
on the adapter and tighten by hand. Use a
wrench to tighten the adapter another half
revolution.
Note: Over tightening may cause damage to
the valve body.
SOCKET OR “SLIP” VALVE WITH PVC PIPE
Use the same procedure as when applying
cementing PVC pipes. Mark the pipe first, then
apply glue to the socket of the valve and the PVC
pipe. Insert the pipe until reaching the mark and
rotate a quarter-turn forward and aft.
Hold the joint in place until the cement hardens.
INSTALLATION ABOVE GROUND
When installed in a manifold above ground:
keep the manifold short, no support will be needed.
For longer spans, a firm support under the
horizontal pipes is recommended for 3” and 4”
valves. Install the valve with the bonnet exposed
to the sun. For 6” valves install the valve with
bonnet horizontally, command chambers side by
side.
INSTALLATION
UNDERGROUND
For underground installations, use trust blocks
where needed, allow sufficient space and keep the
area around the valve free from rough objects
and stones. Cover the valve with clean soil.
A 0.6m (24”) cover is recommended to protect the
valve from heavy equipment.
The controls for the valve, such as the pilot, 3-way
valve, can be installed above ground. Mark the control
tubing by color or number and place a protective poly or
PVC tubing around the control tubing.

PRESSURE TESTING
Partially fill the trench around the valve.
Charge the system and check for leaks.
Note: Do not exceed the pressure rating
of the valve. (10 bars / 150 psi).
DIAPHRAGM REPLACEMENT
Loosen bolts, remove old diaphragm and
insert new one.
Tighten the bolts, applying even pressure in
the diagonal pattern, until the diaphragm is
firmly pressed between the body and the
bonnet. Do not over tighten.
If there is a leakage between the bonnet and
the valve body, tighten the nuts a little more.
MODELS:
3" Threaded
3" solvent welded
4" solvent welded
6" solvent welded
Basic valve structure S- 95, 96

PLASTIC VALVES
80 Series
The 80 series valves are GRP rigid seal,
diaphragm actuated type valves, designed
especially for green-house irrigation and is
also widely used for turf and crop irrigation.
The valves are available in angel or globe pattern and offer
unique features and benefits such as large passage inlet
labyrinth device for the 2-way electric valve that reduces the
risk for clogging under low water quality conditions, 3-
position manual override for the 2-way electric valve, which
allows overriding the electric control at any control mode,
built in Easyclean
R
filter and more.
Available sizes: 3/4", 1" – Turf irrigation valve
11/2", 2" – globe & angel irrigation valves
Main Features
Simple, reliable and economical.
Unique clog-free inlet labyrinth used as the water inlet
restriction at the 2-way version.
3-position manual override at 2-way version.
Operation from near- zero flow to max. flow.
All control system's devices are assembled on the
valve's bonnet; no tubes are connected to the
valve's body.
Optional throttling handle
Integral stainless-steel Easyclean
R
filter.
Stainless-steel bolts & nuts. Nuts are held in
housing, preventing it from dropping during
assembly disassembly.
2-way electric S-80 valve parts
Wide water passage
in restriction
labyrinth
Self-Flushing
filter
3-position
Override
Solenoid valve
Flow direction

1½" – 2" Globe & Angel Valves

¾" – 1" Turf Irrigation Valve

BACKFLUSHING
CONTROL VALVES
Flush mode Irrigation mode
Operation principals
By models
58 P 58
51, 52 57
62, 63
DESCRIPTION
Backflush valves are 3-way hydraulically operated
diaphragm valves used in filtration applications with
media and disc filters.
The PLASLITE is a non-corrosive valve using an
innovative design eliminating maintenance.
The bronze backflush valve can also be easily
maintained by virtue of its design.
The selector valve is activated by pipeline pressure.
The valve can be set in one of two positions:
Irrigation mode allows flow from the inlet manifold into
the filter.
Flushing mode closes the filter inlet and opens the
flush outlet, resulting in flow reversal in the filter.
The valve is activated by a large rubber diaphragm,
requiring minimal activation pressure.
The valve can be operated automatically (using solenoid
valve activation) or manually (Using 3-way selector
valve).

ADVANTAGES
Structural simplicity
Superb hydraulic performance
Frictionless position changeover (58, 58P, 57)
High reliability
Corrosion-resistant materials (plastic, brass)
Easy maintenance
MATERIALS
HYDRAULIC PERFOMANCE
Model 51 52 62 63 57 58 58 P
Body cast bronze Cast iron
Reinforced
polyamide
Bonnet
Reinforced
polyamide
Cast iron
Reinforced
polyamide
Shaft Stainless steel
Spring Stainless steel
Nuts and bolts Stainless steel
Sealing disks Brass plastic brass plastic
O Rings NBR EPDM
Seal NR
Diaphragm Reinforced NR
58575251MODEL
3X24X33 X 22X 22X 2SIZE
90160904040m
3
/h
396704396176176gpm
Max.
recommended
flow at filtering
40904040
40
m
3
/h
176396176176176gpm
Max.
recommended
flow at flushing
7-100mwc
10-147psi
Pressure range
1301601305243Kv (metric)
1501851506050Cv (US)
Flow rate factor
at filtering
5870583737Kv (metric)
6781674343Cv (US)
Flow rate factor
at flushing

*Optional- High Pressure valve- up to 160 m'
MODEL 58 58 P
SIZE 4X3 3X3 2X3 4X4 3X4
m
3
/h 160 90 90 160 160Max.
recommended
flow at filtering gpm 704 396 396 704 704
m
3
/h 90 90 40 160 90Max.
recommended
flow at flushing gpm 396 396 176 704 396
mwc 7-100
2-60
(5-80 in High pressure model)
Pressure range
psi 10-150
3-90
(7-120 in High pressure model)
Kv (metric) 160 130 130 160 160Flow rate factor
at filtering Cv (US) 185 150 150 185 185
Kv (metric) 70 65 57 83 70Flow rate factor
at flushing Cv (US) 81 75 66 96 81
MODEL 62 63
SIZE 2X4 3X4 4X4 3X3 2X3 3X3 4X4
m
3
/h 160 160 160 90 160Max.
recommended
flow at filtering gpm 704 704 704 396 704
m
3
/h 40 60 160 90 40 90 160Max
recommended
flow at flushing gpm 176 265 704 90 176 90 704
mwc 3 - 120
Pressure range
psi 4 - 175
Kv (metric) 160 160 160 100 100 145 205Flow rate factor
at filtering Cv (US) 185 185 185 115 115 170 237
Kv (metric) 110 140 205 145 80 100 160Flow rate factor
at flushing Cv (US) 128 163 238 168 93 115 185

Pressure losses on
Single chamber valves
Pressure losses on
double chamber valves

STRUCTURE AND COMPONENTS OF BACKFLUSH VALVES
Model: 57, 58
Size: 4x3

Model: 57, 58 SK version
Size: 3x2

Model: 51, 52
Size: 2x2

Model: 62, 63
Size: 3x2, 3x3

Model: 62, 63
Size: 4x3, 4x4

AUTOMATIC
CONTROL VALVES
32 Automatic Control Valves OPERATION MANUAL Section 2
Automatic Control Valves…………………………………………………………...33
Control System Characteristics…………………………………………………….34
Pilot Valves…………………………………………………………………………...38
Automatic Control Functions………………………………………………………..52
Valve and Pilot Selecting……………………………………………………………56
Solenoid Valves ………………………………………………………………..……57
Electric Valves – Wiring Sizing………………..……………………………………58
GEMSOL solenoid Components and Electrical Hook- Up……………………….61
Hydraulic Remote control – Principals and Assembly Schematics…………….62
Pressure Reducing Valves – Valve Design in Different Field Conditions……...67
Valves – Pressure Sustaining, Pressure Relief Sustaining,
Sustaining Relief, Sustaining Quick Reacting,
Surge Anticipating………………………………………………………...69
Pump Control Valves – Operating sequence …………………………………….71

AUTOMATIC
CONTROL VALVES
6" 3-way pressure
sustaining
3" electric
4" 3-way pressure
reducing
2" remote control &
Pressure reducing
DESCRIPTION
An automatic control valve is combined of:
A basic valve
One or more pilot valves
A solenoid pilot valve (on electrically actuated valves)
Control tubes and fittings
A filter for the actuation pressure source
Other accessories (relays valves, check valves,
needle valves, etc.)
Each one of the listed control valves is designed to
perform a special hydraulic control function. The
pilot valve and other devices are selected to serve
this function. These valves are self-contained and
include all the components needed for accurate,
dependable, long-life operation.
Unlisted combinations of control functions are
supplied on request.
TWO CONTROL MODES ARE SUPPLIED
THREE-WAY MODE (“3-WAY”)
The pilot valve is a selector, activated manually, electrically,
or hydraulically. It vents the main valve control chamber to
the atmosphere, permitting full opening.
TWO-WAY MODE (“2-WAY”)
The pilot valve is a modulating, hydraulically-operated
type, venting the main valve control chamber to
downstream, allowing only partial opening. This control
model is selected when permanent pressure loss is
tolerated.
Please refer to next pages for more details.

CONTROL SYSTEMS
CHARECTARISTICS
The two control concepts
PILOT VALVES CONTROL TRIM OPERATION:
Low pressure in sensing chamber (4):
The spring (1) is compressed by the adjustment
bolt (2), forcing diaphragm down.
The shaft (5) is moving with the diaphragm, actuating the main
valve by opening or closing pilot valve's internal water passages.
Pilot valve set-point
The pilot valve's position is determined by the forces equilibrium
of hydraulic pressure and spring resistance.
Spring resistance is adjusted by the adjustment bolt (2).
Compressing the spring (turning the bolt in clock-wise direction)
increases the regulated parameter.
For example-
In Pressure Reducing valves- tightening the bolt (turning in clock-
wise direction) will increase the maximal downstream pressure.
In Pressure Sustaining valves- tightening the bolt will increase the
minimal upstream pressure.
In Flow Control valves- tightening the bolt will increase the maximal
flow rate.
A specific spring has specific pressure range in which it can regulate. Springs
are marked by different colors that represent different pressure ranges, and
correct spring selection is critical for the Pilot valve function.
Colored rings located on the adjustment bolt specify the internal spring color.
The spring selection is usually done by "DOROT" according to the client's
data and demands but spring replacement can be easily done by the client if
conditions demand.
High pressure in sensing chamber (4):
The pressure in the sensing chamber (4) is
overcoming spring (1) resistance, forcing the
diaphragm (3) up.

Required regulated pressure:
Pilot valve is preventing flow at
all passages. Main valve
maintains fixed position.
Low regulated pressure:
Pilot valve is connecting
the valve's control
chamber to the
atmosphere. Main valve is
opening.
High regulated pressure:
Pilot valve is connecting the
valve's control chamber to the
upstream. Main valve is
closing.
THREE-WAY CONTROL (POSITIONING) SYSTEMS
The three-way control device is a selector pilot (activated electrically,
manually or by the pipeline pressure) which admits the control media
into the control chamber to close the valve, relieves the media from the
control chamber to open the main valve, or locks the volume in the
control chamber to keep the valve throttled at a fixed regulating
position.
This control principle allows for full opening of the main valve when
operating conditions require the valve to be fully open.
Three-Way Control is used for:
On-Off Control valves.
Regulating valves which need to
operate with low pressure differential.
Dirty water as raw irrigation water and
sewage water.
Where usage of external control media
(such as pressurized air) is required.
TYPICAL DESIGN AND OPERATION PRINCIPLE
OF 3-WAY PILOT VALVES
A 3-way pilot valve's position is determined by the position of its internal
diaphragm. The diaphragm is attached to a shaft which slides up or down
according to the diaphragm's position. The shaft opens or closes the internal
water passages in the pilot valve.
3- Way pilot valve operation principle:
(Referring to a valve that opens at low regulated pressure
and closes at high regulated pressure (such as PR)).

Low regulated pressure
High regulated pressure
TWO-WAY CONTROL SYSTEMS
In a two-way control system, the upstream side of the valve is
connected by a control tube to the control chamber and to the
downstream side of the valve.
Two flow restrictors, one (orifice or needle valve) assembled
upstream of the control chamber and the other (a pilot valve)
assembled on the downstream side; modulates in response to the
pipeline pressure. The relative opening of both restrictors dictates
the position of the main valve. This type of control principal
provides very accurate and sensitive regulation but creates
considerable pressure loss even if no regulation is needed.
Two-Way Control is used when:
Minimal pressure differential at all operating conditions
allow it.
Sensitive (fast response) regulation is required.
Note: Two-Way Control should not be used if the network
media is very dirty or abrasive.
TYPICAL DESIGN AND OPERATION PRINCIPLE
OF 2-WAY PILOT VALVES
2-way pilot operation principal:
(Referring to a valve that closes at low regulated pressure
and opens at high regulated pressure (such as PS)).
Low regulated pressure: The flow into the main valve
control chamber is restricted by the restrictor orifice
(a). As regulated pressure (beneath the diaphragm) is
lower then the pilot's set-point, the diaphragm and the
shaft are descending, sealing water passage
downstream and closing the main valve.
High regulated pressure: As regulated pressure exceeds
the pre- determined set point, the diaphragm is forced up
and the shaft opens the water passage from the control
chamber to the downstream tube, causing opening of the
main valve.

Required regulated pressure
Required downstream pressure: As regulated
pressure reaches the pre- determined set-point, the
forces above and beneath the diaphragm are in
equilibrium. The diaphragm stabilizes at an intermediate
position, allowing similar flow through the pilot valve and
the restrictor orifice (a), resulting in constant water
volume in the control chamber and the main valve
maintains fixed position.
Note: the flow through the first restricting element (a
needle valve or an orifice) will determine the valve's
closing rate.
The flow ratios between the first restricting element and
the pilot (in its fully opened position) will affect the
valve's head loss when no regulation is needed.

PILOT VALVES
3- WAY PILOT VALVES FOR CONTROL APPLICATIONS OF
HYDRAULIC VALVES UP TO 4"
29-100 29-300 29-200
29-100 / 29-200 – Pressure reducing applications
29-200 – Pressure sustaining / relief applications
29-300 – Flow control and pressure differential
regulation applications
Table 5.
SPRING PRESSURE REGULATING RANGES
Operation conditions recommendation:
Max. proof pressure (upstream): 10 bar (145psi)
Spring selection should be so that the required set
pressure is in the middle of the springs range.
Spring no. Spring color Regulation range (m) Regulation range (psi)
54 Green 45 – 10 66-15
72 Yellow 25 -5 36-8
65 Red 60 – 20 90-30
82 (29-300) 5 – 2 8-3

Pilot valve model : 29-100
Spring No. 65 (yellow) Cat.No.0022065000
Spring No. 72 (Red) Cat.No.0022072000
Spring No. 54 (Green) Cat.No.0022054000
Diaphragm assembly kit

Spring No. 82 (Differential) Cat.No.00220 000

3- WAY RELAY VALVES FOR ON / OFF
APPLICATIONS OF HYDRAULIC VALVES
25-300 – Quick reacting hydraulic relay for on / off applications.
25-100 – Adjustable hydraulic relay for on / off applications.
GALIT - Hydraulic relay for on / off applications.
Max. proof pressure (upstream): 10 bar (145psi)
GALIT – max. elevation difference – 22 m.
PRESSURE RANGES:
Relay Pressure range
25-300
10-100 (m) / 15-150 (psi)
Minimal command pressure/ line
pressure Ratio : 1/3
25-100 7 – 100 (m) / 10-150 (psi)
GALIT 5 – 100 (m) / 8-150 (psi)
GALIT 25-300 -

Relay valve model: 25-300
Parts kit Cat.No.
6652530008
Parts kit Cat.No.
6606253000

2- WAY PILOT VALVES FOR CONTROL APPLICATIONS OF
HYDRAULIC VALVES UP TO 6"
68-500 68-410
68-410 - Pressure Reducing applications.
68-500 - Pressure Sustaining / Relief.
Max. proof pressure (upstream): 25 bar (360 psi)
Table 6.
SPRING PRESSURE RANGES – 68-500
Table 7.
SPRING PRESSURE RANGES – 68-410
Spring no. Spring color Regulation range
58 (standard) Green 10-90 (m) / 15-130 (psi)
86 Yellow 5-20 (m) / 8-30 (psi)
63 Red 80-140 (m) / 120-205 (psi)
Spring no. Spring color Regulation range
66 (standard) Green 10-110 (m) / 15-160 (psi)
78 Yellow 5-30 (m) / 8-45 (psi)
67 Red 20-200 (m) / 30-300 (psi)

Pilot valve model: 68-410
Diaphragm kit Cat.
No. 6671868410
Spares kit Cat.
No. 6606841001

Diaphragm kit Cat.
No.6671868500
Spares kit Cat.
No. 606850000

2- WAY AND 3-WAY PILOT VALVES FOR CONTROL APPLICATIONS
OF HYDRAULIC VALVES OF LARGE DIAMETER (3" – 24")
CX-PR CX-PS 66-310 31-310
66-310 – 2–w/ 3-w Pressure Reducing/ Sustaining
/Quick Relief applications.
31-310 – Pressure Reducing / Sustaining applications.
CX-PR – 2-w Pressure Reducing applications.
CX-PS - 2-w Pressure Sustaining applications.
Max. proof pressure (upstream): 66-310 -12 bar (20 psi) high pressure version- 25 bar (360 psi)
CXPS, CXPR, 31-310 - 25 bar (360 psi)
Table 8.
66-310 range 31-310 range (m) CX – PR / PS range
Spring no. Spring color
(m) (psi) (m) (psi) (m) (psi)
47 (st.) Green 10-60 15-90 10-60 15-90
42 Yellow 5-30 8-45 5-30 8- 45
50 / 56 Red 20-90 30- 135 20-86 30-125
76 black 70-140 105-210
70 2-5 3-8
69 6-8 9-12
53 (st.) 10 - 200 15-300
Double
Spring 53+54
10 - 250 15-375
SPRING PRESSURE RANGES
Note: Pilot Valves specified in this section are
not the full verities of DOROT pilot valves.
If the pilot valves specified do not answer your
needs, please connect DOROT technical
department.

- Cat.No.6671866310
Spare parts kit - Cat.
No. 6606631000

Spring # 47 (Green) Cat. No. 0022047000
Spring # 50 (Red) Cat. No. 0022050000
Spring # 42 (yellow) Cat. No. 0022042000
Spring # 70 (no color) Cat. No. 0022070000
Diaphragm kit Cat.
No.6671831310

Pilot valve model: CX-PR
Spring # 53 (Standard) Cat. No. 0022053000
Spring # 07 (Differential) Cat. No. 0022007000

Pilot valve model: CX-PS
Spring # 53 (Standard) Cat. No. 0022053000
Spring # 07 (Differential) Cat. No. 0022007000
Spring # 07 (High pres.) Cat. No. 0022054000
Diaphragm kit Cat.
No. 66718CXS00

AUTOMATIC CONTROL FUNCTIONS
MANUAL ON-OFF VALVE (M)
Equipped with a 3-way manual selector valve, permits the
selection of the “open” or “closed” position of the main valve.
Control Devices: 3-way valve
Available: On all 3-way controlled valves
ELECTRIC CONTROL VALVES (EL)
A 3-way solenoid valve, activated by an electric current or
electric pulse, opening or closing the main valve. “Normally
closed” position of the main valve is standard. “Normally
open” position is optional. Electric activation can be added to
most control valves on request.
Control Devices: Sizes 3/4” - 6” - Solenoid Valve.
Sizes 8” - 24” - Solenoid Valve
+ Accelerator Relay
Available: On all models
PRESSURE REDUCING VALVE (PR)
The valve maintains a preset downstream pressure,
regardless of upstream pressure or flow rate
fluctuation. The main valve is controlled by a 3-way
pilot valve (permitting full opening when downstream
pressure drops below the set-point) or by a 2-way pilot
valve (creating a pressure differential in any condition).
Control Devices: 29-100, 31-310 Pilot Valves (3-Way)
CX-PR, 68-410, Pilot Valves (2-Way)
PRESSURE SUSTAINING / RELIEF VALVE (PS)
The valve maintains upstream (inlet) pressure, regardless of
flow rate variations. The valve will be in the “closed” position if
the inlet pressure drops below the set-point. It fully opens when
upstream pressure exceeds the set-point.
Control Devices: 29-200, 31-310, 66-310 Pilot Valves (3-Way)
68-500, CX-PS Pilot Valves (2-Way)

QUICK RELIEF SAFETY VALVE (QR)
The valve opens instantly when the pressure in the pipeline
exceeds the safe level, thus relieving excess pressure in the
network. When pressure returns to normal, the valve closes slowly,
at an adjustable pace.
Control Devices: 31-310, 66-310 Pilot Valves (3-Way)
CX-PS, 68-500 (2-Way)
Large diameters – GALIL valve accelerator
Available: On models: Cast Iron, Cast Bronze 2”- 24”
HYDRAULIC REMOTE CONTROL VALVE (RC)
An hydraulic relay opens or closes the valve (on which it is
assembled), in response to a pressure command, carried by a
control tube from a remote control center. The relay permits:
Quick response to the “open” and “close” command.
The conversion of a valve form “normally-open” to “normally
closed”.
Overcoming elevation differences (25-100 relay)
Control Devices: “Galit” Relays, 66-210 Relay, 25-100 relay.
Available: On all models, excluding electric valves
FLOW RATE CONTROL VALVE (FR)
The valve limits the flow rate in the network to a preset level,
regardless of inlet pressure variations. The valve fully opens
when the flow rate drops below the set-point.
Control Devices: 29-300, 76-200, CX-SD Differential Pilot
Valves.
Available: On All models 2”- 24”
EXCESSIVE FLOW SHUT-OFF VALVE (FE)
- A VARIATION OF THE FLOW RATE CONTROL
The valve closes drip-tight when the flow rate exceeds the
preset maximum (due, for example, to pipe rupture).
Control Devices: 29-300, 76-200 CX-SD Differential Pilot
Valves.
Available: On All models 2”- 24”
MODULATING FLOAT CONTROL VALVE (FL)
The main valve is controlled by a 1/2" control valve,
located in the tank or reservoir at the required max. water
level. The valve maintains a constant max. level.
Control Devises: 70-300 (plastic),
70-400 (metal) float pilots.
Available: On all models.

DIFFERENTIAL FLOAT CONTROL VALVE (DI/FL)
A float valve controls the main valve, closing it when the water
reaches the maximum level, and opening it when the water
drops to its preset minimum level. The differential between
maximum and minimum levels is adjustable.
Control Devices: 70-550, 70-610 Differential Float Valves
ALTITUDE CONTROL VALVE (AL)
The main valve is controlled by a highly-sensitive pilot
located outside the tank. The pilot opens or closes the valve
in response to the static pressure of the water. The
difference between maximum and minimum levels may be
adjusted on the pilot.
Control Devices: 70-110 Pilot Valve (3- Way)
70-600 Pilot Valve (2- Way)
PUMP CONTROL VALVE (BC)
The valve eliminates damaging surges caused by pump
“start-up” and “shut-off”. The electrically activated valve
opens gradually on pump “start-up”, and closes slowly
before the pump is switched off. The valve can operate as a
check valve, preventing reverse flow.
Control Devices: Solenoid Valve, 66-210 Relay,
Limit Switch, solenoid valve
Available: On models: Cast Iron, ductile iron
TWO-STAGE OPENING VALVE (TO)
The valve prevents surges, caused by the fast filling
of drained pipelines. It restricts the flow rate until the
network is full. The valve fully opens when
downstream pressure reaches the duty point.
Control Devices: 68-500, 66-310, 29-200 Pilot Valves

DEEP WELL CONTROL VALVE (DW)
The valve eliminates surges caused by “start-up” and
“shut-off” of vertical or submersible pumps. It is a relief
valve, assembled on the T-junction of the main pipeline.
When the pump starts, the valve closes slowly, increasing
the network pressure gradually. Before pump “shut-off” the
valve opens slowly, reducing network pressure gradually.
Control Devices: Solenoid Valve, 66-210 Relay, Limit Switch
Available: On models: Cast Iron, Cast Bronze
SURGE-ANTICIPATING VALVE (RE)
The valve protects the pumping system from water hammer,
caused by sudden pump halting (due, for example, to power
failure). The valve is a relief valve, assembled on the
T-junction of the main pipeline. The valve opens instantly
when the pump stops, relieving the returning high pressure
wave. The valve closes slowly, once the pressure returns to
static level. The valve functions also as a quick-relief safety
valve.
Control Devices: 66-310, CX-PS Pilot Valves
Available: On models: Cast Iron, Cast Bronze 3” - 24”
HYDRAULIC HYDRANT VALVE (HY)
A quick-activation fire extinguishing valve. A two-position
manual selector allows for quick, effortless operation of the
valve. A remote controlled valve is optional.
Control Devices: Manual Selector
Available: On models: Cast Iron
DELUGE VALVE (DE)
A control valve for “Dry” sprinkler lines in fire-extinguishing
systems. The valve opens on electric command or pressure
drop in pressurized sensor line. (Hydraulic or pneumatic)
Control Devices: 66310 Pilot Valve, Solenoid Valve
Available: On models: Ductile Iron
ELECTRONICALLY CONTROLLED VALVE (EC)
The main valve is controlled by PLC controller (DOROT
"CONDOR") through 2 solenoid valve controlling
command chamber inlet and outlet.
The controller enables selection from a vast range of pre-
programmed control functions and their combinations.
Control devises: Solenoid valve, PLC controller
Available on: on all models

VALVE and PILOT
SELECTING
EXMAPLES OF CHOOSING THE VALVE, DIAPHRAGM AND PILOT
ACCORDING TO FIELD CONDITIONS:
A.
Function: Pressure Reducing
Flow rate: 100 m
3
/h (440 gpm)
Max. upstream pressure: 4 bar (60 psi)
Required downstream pressure: 2 bar (50 psi)
Making the selection:
Valve size: consideration: Flow rate
- refer to table 4. (Page 10) – Continues flow 100 m
3
/h ---selecting 4" valve.
Diaphragm: consideration: Upstream pressure
- refer to table 3. (Page 9) – The given pressure is within 12-160m (1.2-16 bar) range --
selecting standard diaphragm.
Pilot : consideration: Function, line pressure and valve size (see page 38)
– PR for 4" valve – 29-100 pilot valve is suitable.
Pilot spring: consideration: Required downstream pressure
– refer to table 5. (Page 31) required pressure is within the green spring pressure
range.
B.
Function: pressure sustaining
Flow rate: 70 m
3
/h (310gpm)
Max. upstream pressure: 18 bar (260 psi)
Sustained upstream pressure: 16 bar (230 psi)
- refer to table 4. – Continues flow 60 m
3
/h --- selecting 3" valve.
Diaphragm: consideration: Upstream pressure - refer to table 3.
– The given pressure is over the standard diaphragm limit (12-160m) and within the High
Pressure diaphragm range (10-259 m) – selecting High Pressure diaphragm.
Pilot: consideration: Function, line pressure and valve size (see page 44)
– PS for 3" valve, 18 bar upstream – 68-500 pilot valve is suitable.
Pilot spring: consideration: Required upstream pressure
– refer to table 8. (page 35) - required pressure is within the red spring pressure range.
C.
Function: On / Off
Flow rate: 300 m
3
/h (1320 gpm)
Upstream pressure: 1 – 1.5 bar (15 - 22 psi)
-refer to table 4. – Continues flow 300 m
3
/h ---selecting 6" valve.
Diaphragm: consideration: Upstream pressure
- refer to table 3. – The given pressure is lower then standard diaphragm range
(15-160 m) and is within Low Pressure diaphragm range (5 – 100 m)
-- selecting Low Pressure diaphragm.
Pilot : consideration: Function, line pressure and valve size (see page 47)
– PR for 6" valve – 66-310 3-way pilot valve is suitable. (3– Way pilot valves allow
lower pressure loss in the main valve. relevant in cases of low pressure).
Pilot spring: consideration: line pressure – refer to table 8.
– Line pressure is within the yellow spring pressure range. (30 – 5m)

SOLENOID VALVES
Options and specifications
Solenoid valves convert an electric signal to
hydraulic command
Solenoid valves are operated by a coil. When an
electric signal is received, the magnetic field created,
pulls a plunger up. This allows water to flow through
the orifices in the solenoid.
NORMALLY OPEN/ NORMALLY CLOSED
POSITION
The solenoid is called normally open (N.O.) when the
water passage from the pressure port to the common
port (connected to the control chamber of the valve), is
open with the solenoid de-energized.
This is the case for field or zone valves; they are kept
closed and when the solenoid is energized the valves
open. The opposite is true for a ‘normally closed’
solenoid.
The solenoid is called normally closed (N.C.) when
common port is connected to the vent port with the
solenoid de- energized.
In most cases a Normally Open (N.O.).solenoid
corresponds with a normally closed valve and vice
versa.
2-WAY/ 3-WAY SOLENOIDS
Solenoids are available in 2-way and 3-way
configurations.
The 3-way solenoid has 3 ports – common, pressure
and vent, and is selecting between connecting control
chamber to pressure or to vent.
The 2-way solenoid is designed with 2 ports- common
and vent and can only allow or stop water passage
through it.
It is not recommended to use a 2-way solenoid in dirty
water conditions; the continuous flow through it makes
it more sensitive to clogging than 3- way solenoid.
SOLENOIDS – PRODUCT SELECTION,
CONSIDERATIONS and APPLICATIONS
Address the following subjects for a 3 -way solenoid:
Material
Electrical characteristics: inrush current, voltage, etc.
Mechanical, orifice size and pressure rating

ELECTRIC VALVES – WIRE SIZING
FOR AC/ DC SOLENOIDS ONLY
(Exclude latching)
GEM – SOL DIRECT OPERATED 3- WAY SOLENOID VALVE
Voltage: AC: 24, 120, 240, 480 V, 60 HZ (or 110,220 V, 50 HZ)
DC: 6, 12, 24, 120, 240 V.
Tolerance: ± 10%
Body: mazak/ brass/ stainless steel.
Max. pressure differential
DOROT DIRECT OPERATED 3- WAY / 3-WAY SOLENOID VALVES
Voltage: 24 VAC / 50 HZ (others on demand)
Tolerance: ± 10%
Body: nylon
Orifice: 1.8 mm
Pressure range: 0- 10 bar
Inrush current: 0.29 A
Holding current: 0.14 A
Orifice (mm)
2.42.01.61.20.8
N.C.N.O.N.C.N.O.N.C.N.O.N.C.N.O.N.C.N.O.
Units
Coil
current/
power
881011151520202325bar
120120150170230230300300350370psi
ADC
10101412171730223530bar
150150210180250250450330530450psi
AC/8W
DC/10W
881011151520202325bar
120120150160230230300300340370psi
AC/5.5W
DC/5.5W
5698101216182020bar
8090140120150180240265300300psi
AC/2.5W
DC/3.5W
3.53.02.52.21.71.41.110.60.6l/min
Kv
factor

ELECTRIC VALVES – WIRE SIZING
FOR AC/ DC SOLENOIDS ONLY
(Exclude latching)
The following formula is used to calculate the wire size:
Iinr*2*L
1000*AVL
Ra
Ra = max. allowable resistance of the wire in Ohms.
AVL= Allowable Voltage loss (V)
L = length from controller to the valves (meters or feet)
I inr = inrush current of the solenoid (A)
The allowable voltage loss for the solenoids can be found in the table below:
+/- 10 % of the nominal voltage as long as the operation pressure is within
the specifications of the solenoid. The voltage output of the controller is
usually 26 Volt depending on how many valves are operated at the same
time. A typical AVL 26.4 V output is +/- 10% of 24V, or 4.8V.
Note: The inrush current depends on the power consumption or wattage of the
solenoid.
Calculating example:
Solenoid Power Inrush Holding Orifice Max pressure
DOROT 3W AC .2 W 0.29A 0.14A 1.8 mm 100 mwc (150 psi)
GEM-SOL 3W AC 5.5W 0.72A 0.42A 2.0 mm 100 mwc (150 psi)
GEM-SOL 3W AC 8.0 W 1.08A 0.60A 1.6 mm 170 mwc (250 psi)
Solenoid in use: GEM-SOL 3 Way 5.5 W.
Inrush: 0.72 A.
Controller to valve distance: 500 m. (1666 ft.)
The allowable voltage loss is 4.8 V (AVL)
Calculating: Ohm66.6
0.72*2*500
1000*4.8
Ra
The resistance of the wire chosen from the above table must be equal or lower than the
calculated value. The wire gauge should be # 14with 8.28 Ohms/km. for the actual
distance (0.5 km) the resistance is 4.14 Ohm. It is possible to use a different gauge for
the hot and common wire; the resistance will be the average of the two wires used.
The inrush current has to be multiplied by the number of valves operated at the same
time. Each segment must be calculated considering Distances and operating valves.
The controller has a maximum Amperage output that should not be exceeded.
1418AWG #
0.250.400.631.001.592.524.026.40Ohms per 1000 ft.
0.811.292.063.275.218.2813.7020.95Ohms per km.

CROSS SECTION WIRE SELECTION FOR DISTANCE INSTELATION OF GEM-SOL
SOLENOID VALVES

GEM-SOL SOLENOID
COMPONENTS
And electric hook-up
1. Loosen bolt (1).
2. Pull hub assembly off.
3. Push (3) out with screwdriver through access port (remove 4).
4 .Connect wires to (1) and (2).
5. Reassemble, the hub can be turned 90 degrees to let port (4) face
sideways.
6. If no conduit tubing is used, seal opening (4) with silicone, to avoid
dirt or moisture from entering. When using conduit, remove the
adapter to connect 1/2” conduit.
Note: Brass solenoids use (3/8”) adapter.
7. The base of the stainless steel solenoid has a manual override; a
screwdriver is used to activate the solenoid.
Off position: the little mark on the slot points down.
8. The brass solenoid base has a knob with a mark. The solenoid is
deactivated when the mark or dot points down. Turning the knob or
screw 90 degrees activates the solenoid.
Part list
1. Bolt
2. Junction box
3. Junction
4. Adapter 3/8" w/ seal
5. Rubber
6. Coil, sleeve nut
7. Coil hub (wire lead)
8. Sleeve
9. Seal
10. Spring
11.Plunger
12.Body of base

HYDRAULIC REMOTE CONTROL
Principles and assembly schemes
1.GENERAL
The hydraulic remote control of "GAL" type valve
is made in order to enable operating all the valves
in the Irrigation system from a central control point,
mostly (not necessarily) from the pump site.
The control is executed by manual or automatic
(electronic) means located in the control center
that sends "open" or "close" commands to the
valves. This publication will not be discussed
Control means, but rather consider the command
as pressure applied to or relieved from the control
tube, regardless of the causing it.
2. REMOTE CONTROL VALVE
Hydraulic relay should be added to the basic
hydraulic valve, in order to enable opening
or closure of the valve by the local pressure.
The relay is activated by increasing or
decreasing the control tube pressure which
is done much faster than transporting the
entire valve's control chamber water to or
from the control center by small diameter
tubes.
DOROT valves can be remotely controlled
by 25-100 adjustable relay, "GALIT" relay or
25-300 Quick Reaction relay, commonly
used for large diameter valves and filtration
system valves.

CONTROL CENTER
CONTROL CENTER
The manual center consists of:
a. 3– Way selector.
b. Pressure source.
c. Connecting tubes divided by Shifts.
(A group of valves operating simultaneously)
3.1. 3- WAY VALVE
Each 3- way valve is connected at one of
its ports to the main line pressure. The
common port (bottom) is connected to a 6
mm tube leading to the relevant group of
valves.
The 3- way valve port allows selection
between the pressure port and the venting
port. The third port remains unused,
reserved for optional connection of
automatic control device.
The 3-way selector valves should be
assembled on a common bracket, each
one marked clearly by its shift number.

3.2. AUTOMATIC CENTER
The device selecting between pressurized control tube and relieved
tube is activated by electric command.
The device can be a solenoid valve or the “Galsol” relay. The latter
has larger passages than the normally used solenoids so it is less
sensitive to clogging, and creates faster response of the controlled
valves.
Any type of solenoid, selected for this function, must be equipped
with a manual override to enable operating the system in case of
electric malfunction.

4. CONNECTING FIELD
VALVES TO THE CENTER
4.1 A 6mm tube should connect all valves
operating simultaneously to one control
device (manual or automatic). There is
no advantage to larger diameter, unless
the valves are located fairly near to the
center, the relay is deleted so the
control water volume must be
transported to the valve from the center.
Using 8mm tube in relay control
increases the cost unnecessarily and
delays valve response.
.4.2 It is recommended to connect all valves
operating in the same shift and located
in short distance from each other by
“chain connection” as described in the
drawing.
The first valve’s relay is connected to
the center. The command port of the
valve outlet is connected to the relay of
the next valve and so on.
Definition: On “open” command, first
valve is open. The next one will open only
when the network of the first valve has
been filled and its pressure rises.
The sequence of events is reversed at
“close” command - the first valve closes,
then the second, etc.
This procedure prevents drop of pressure
due to increased flow through the initial
stage of network filling. It makes the
changeover between shifts smoother, with
less pressure fluctuation.
It is possible, however, to connect all the
relays directly to the tube leading to the
center. If this option is selected, all the
valves may get the command at the same
time.

5. ELEVATION DIFFERENCE BETWEEN CONTROL
CENTER AND FIELD VALVES
5.1 Center higher than the valves: a spring should be added to the GALIT
relay, in order to compensate for the static pressure existing in the
control tube at the valve site, while it is relieved at the control center.
Use a spring selection table of the GALIT relay in order to determine the
proper spring.
In case of very large elevation difference (more than 25m) it is advisable
to use the 25-100 relay or 29-100 mini-pilot as a relay. (See Remote
Control valve drawing).
5.2 Center lower than the valves: Draining of the control tubes and entry of
air into them will Cause excessive delay of valve response. It is possible
to avoid it by connecting a short tube to the venting port of the control
device. The other end of this tube is inserted into a water bottle. Air entry
is prevented.
6. DESIGN OF HYDRAULIC CONTROL
6.1 Define the groups of valves connected together in the same shift.
6.2 Draw the shortest route of the control tube leading to the valves and
groups of valves, considering the physical obstacles (roads, pipelines,
etc.).
6.3 Check elevations and select springs. Mark the selected spring (green,
white, etc.) on the map, at the specific valve location.
6.4 Calculate total quantity of tubes; add some 15% as safety margin.
6.5 Define type of central control (Manual / Automatic).
7. INSTALLATION OF CONTROL TUBES
7.1 Underground installation is preferred.
In case the remote control is designed at the initial stages of the project
design, laying the command tubes in the main pipe trenches is
advisable. Otherwise, bury the tubes in a depth, which prevents damage
by tractor implements, heavy machinery crossing, etc.
It is recommended to lay the tubes beside roads, windbreakers, etc.
even if it increases the total length.
Prevent stretching, stress of tubes, kinking, stone damage.
At a specific point, beside controlled valve or even at other points along
the tube route, create a “check point” where the tube is extended above
ground for pressure test in case of possible malfunction in the future.
This practice may prevent the need of replacement of total length of tube
as it enables finding of the damaged section.
Such checkpoints must be marked clearly to prevent accidental damage
by machinery.
7.2 Above ground installation.
Do not lay the tubes uncovered on the ground as it calls for inevitable
damage, sooner or later.
Hang the tubes on a wire, suspended on poles at proper height, so they
will not be in a way of passing workers, and trucks.
7.3 Mark both ends of an installed tube by a tag with the name or number of
the controlled valve / group. Large number of controlled valves requires
many tubes assembled at the same route, and the marking may prevent
a lot of hassle and mistaken connections. It is recommended to purchase
“coded tubes”, marked by various colored lines, which help considerably
in proper connections.

PRESSURE REDUCING VALVES
VALVE DESIGN IN DIFFERENT CONDITIONS
1. APPLICATION EXAMPLE - VINEYARD
Conditions: Regular conditions with stable upstream
pressure. Vineyard drip system with set pressure
conditions that remain fairly constant.160 acre block with
a pressure reducing valve for every 20 acres:
Flow (Q) = 50 m
3
/h (200 gpm)
Inlet pressure = 1.5-2.5 bar (25-40)
A. DESIGN CONSIDERATIONS
Valve requirement- PR
Required downstream pressure: 1.3 bar (20 psi)
B. SELECTION CONSIDERATIONS
Material – iron, bronze, plastic
Size and diaphragm choice (see page 41 )
Pilot and spring selection (see page 41 )
C. SELECTION
The pressure allows using plastic/ PVC valves and plastic
pilots. The flow requires 3" valves. Standard diaphragm is
suitable. Yellow spring is suitable for the required pressure.
2. APPLICATION EXAMPLE - ROW CROP
Conditions: a high pressure reducing ratio and
cavitation conditions.
Cavitation: when the water pressure drops below
the vapor pressure, bubbles form in the restriction
area. Downstream, when the pressure recuperates,
the bubbles collapse, causing damage to the valve
body. Exceeding reducing ratio of 3:1 may cause
cavitaion.
Row crop application: 0 acre block with 5-20 acre
zones. Each 10-acre is controlled by a valve.
Valves can be operated in pairs (20 acres) or
individually. (10 acres).
System flow (Q) = 140-70 m
3
/h (600-300 gpm)
Inlet pressure = 2-3.5 bar (30-50 psi.)
.
A. DESIGN CONSIDERATIONS
Valve requirement PREL.
Required downstream pressure: 0.7 bar. (10 psi)
B. PRODUCT SELECTIONS
Material – iron, bronze, plastic
Size and diaphragm choice (see page 41 )
Pilot and spring selection (see page 41 )
Solenoid selection (see pages 42-43)
C. SELECTION
A 70 m
3
/h flow requires a 3” size valve. The pressure
range makes the PVC valve a logical choice unless an
angle configuration is preferred. Pressure range allows
using plastic pilot and the regulating pressure requires
yellow spring. The above example presents one
problem: when only one valve operates, the inlet
pressure increases to 3.5 bar (50 psi). This creates a
5:1 reducing ratio which causes cavitation.
How often will this condition occur?
Solution: Use a PVC valve with plastic pilot, both
offer high resistance to destructive cavitation.

3. APPLICATION EXAMPLE - 3” VALVE WITH
SPRINKLER AND DRIP IRRIGATION
Discuss similar configuration as the example 1, but the
same valves are used for:
Drip irrigation, requiring 1 bar (15 psi) downstream
pressure.
Sprinklers irrigation during germination of crop,
requiring 4 bar (60 psi) downstream pressure.
The inlet pressure is always 4 bars (60 psi)
Solution:
Add another pressure reducing valve, (marked in
red) located on the main line. The field valves
(marked black) are the same as selected in example
1. (Plastic valves 3").
The main PR valve (red) will reduce pressure to 2
bar (30psi) when selector points to 'auto'and will be
fully open when pointing to 'open'. The field valves
will reduce pressure to 1 bar when selector point to
'auto', will be closed when it point to 'closed'or fully
open when it points to 'open'.
At sprinkler irrigation- main valve is fully open - field
valves are fully open.
At drip irrigation - main valve is reducing pressure to
2 bar, the field valves are reducing pressure to 1bar.
.
4. APPLICATION EXAMPLE – HUNTING OF
PILOT VALVES
This configuration presents two PR valves in series.
Water supply is a pressurized pipeline with varying
upstream pressures during the season. There are
also pressure reducing valves in the field.
Considerations: ‘Hunting’ and solutions to this
problem.
Hunting is the continuous readjusting of the valves
to find the right pressure setting.
It may appear in configurations such as described
above due to mutual influence of the pilots.
The use of two 3-way controlled valves and short
distances between the valves aggravates the
problem. Restricting the discharge out of the vent
port of the pilot may help. Connecting a dripper to
the vent port or connecting the vent port to
downstream usually solves the problem.
Longer distances between the valves and using a 2-
way PR valve on the mainline valve will prevent the
hunting phenomenon.

VALVES
Pressure sustaining, sustaining relief,
Sustaining quick-reacting relief, surge anticipating
PRESSURE SUSTAINING VALVES
PS valves maintain a preset pressure level
upstream of the valve. It is located in the
main line. The size has to fit the maximum
flow rate in the system.
Application: Pump control valve, dictates
the pump's duty point in a desired range to
prevent overload. If the pump curve is flatter,
other solutions can be found. A flow rate
control valve can be chosen.
SUSTAINING RELIEF VALVE
Installed in a T-configuration off the mainline
to sustain a certain level of pressure in the
mainline. The water is returned to the well or
reservoir.
For this application it is important to consider
the following design criteria:
The valve should be sized according to
the estimated by-pass flow rate.
It can be operated for considerable length
of time. (not a quick-reacting relief)
The drop of pressure through the valve
may exceed the recommended reduction
ratio.
Reducing the cavitation risk:
Consider installing an orifice or a gate
valve on the discharge side and/ or keep
the discharge line relatively small to
create friction (back pressure).
Put valve at end of discharge line: There
is no cavitation when the downstream
pressure cannot build up.

!
"#
$ % !& '
!( )#*
+ % , -!# %)#*
SUSTAINING QUICK-REACTING RELIEF
VALVE
QR valve are designed to protect the system
components from destructive pressure rises.
Opens quickly, closes slowly and operates for
short duration of time.
Designed for high flow rate: up to 16 m/s.
Use bronze when possible.
Discharge line should be large enough to allow
unrestricted flow.
Pilot has two positions: Open or close (not
regulating) and has a 5% tolerance.
For example - 7.5 mwc (11 psi) tolerance at.150
mwc (220 psi).
SURGE ANTICIPATING VALVE
.
Installed in a T-configuration off the mainline, the
RE valve is used to protect the mainline against
water hammer created due to sudden pump
stoppage (power failure). As pump stops, the
pressure near it drops significantly and then rises
drastically as the high pressure wave returns.
The valve is equipped with a pilot which opens it
when an exceptional low pressure is sensed. The
returning high pressure wave can then be
released. Valve closes slowly.
The system contains another pilot which opens the
valve as high pressure is sensed and protects the
line from pressure surges created by sudden flow
reduction etc.

PUMP CONTROL VALVES
Concept & operating sequence
System risks at pump start-up and shut-off:
Excessive flow rate at the system filling phase may
cause pump overload, cavitation and high water
surges as the line is filled and velocity dramatically
changes.
Surges are likely to appear also at pump's shut-off or
power failure due to sudden flow stoppage.
OPERATION SEQUENCE
1. Pump starts first.
2. Solenoid on valve is energized e.g. 2 minutes later.
3. The solenoid is connected to a relay, which allows a
bigger passage to bleed the water from the bonnet.
4. A needle valve can be used to regulate the opening
speed.
5. When system stops, the solenoid of the valve is first
de-energized.
6. A position indicating rod on the valve with a limit
switch signal, the pump when the valve is closed
and pump shuts off.
Some turbine pumps cannot operate against a
closed valve, it may damage the impellers!
As Pump shuts off due to power faiure, a reverse
flow is stopped by a check valve feature on the
valve.
To protect the mainline against this sudden closure
(water hammer); a surge anticipating valve is
installed in T-configuration to the mainline.
Two-stage opening application is used to fill the
mainline slowly, only when pressurized, valve opens
fully. This feature also prevents the electric motor
from overloading and can be added to the standard
Pump Control valve.

OPERATING INSTRUCTIONS/
TROUBLESHOOTING GUIDE
Electric Valve Normally Closed................................. ………………………………………….73
Electric Valve with Relay Normally Closed................... ………………………………………..75
Manual Electric Valve Normally Closed................................................................................77
Remote Control Valve...........................................................................................................79
Pressure Reducing Valve 3-Way..........................................................................................82
Pressure Reducing Sustaining Valve 3-Way....................................................................... 87
Pressure Reducing Valve 3-Way Quick-Reacting................................................................89
Pressure Reducing Remote Control Valve...........................................................................91
Pressure Sustaining Valve 3-Way........................................................................................94
Pressure Sustaining Valve Normally Open...........................................................................98
Two-Stage Opening Valve...................................................................................................104
Quick Pressure Relief Valve................................................................................................106
Surge Anticipating & Quick Relief Valve..............................................................................112
Pressure Reducing Valve 2-Way.........................................................................................118
Pressure Reducing Sustaining Valve 2-Way.......................................................................122
Pressure Sustaining Valve 2-Way.......................................................................................126
Booster Pump Control Valve................................................................................................130
Booster Pump Control &
Flow Rate Control Valve......................................................................................................132

ELECTRIC VALVE
Normaly Closed
Operating Instructions for 1" – 4" valves
Components Part Numbers
a. Solenoid 30 - NO
b. Filter 81-1/4"-24
INSTALLATION
The arrow on the bonnet should match the flow
direction.
Filter (b) is installed at the upstream side of the
valve.
The valve can be installed in any position.
If below ground level, use a valve box to protect it.
Use five layers of teflon tape for all threaded valves.
Use primer and heavy duty solvent for the socket
style PVC valves.
Bolts of flanged valves should be tightened in a
diagonal sequence.
ADJUSTMENTS
The common port of the solenoid (a) base, (c), is
connected to the bonnet of the valve. Port (p) is
upstream pressure connection and the port marked
(2) at the base is the vent port.
Note: A Normally Open valve uses a Normally Closed
(N.C.) solenoid (a). The connections to the vent (2)
and pressure port will be reversed!
Start the pump or open the main valve. If the
solenoid (a) is not energized, the valve closes. (N.C.
Valve)
When the solenoid (a) is energized the water in the
control chamber will vent through the solenoid (a)
and the valve opens.
The manual override of the solenoid (a) should be in
the auto position.
MAINTENANCE
Keep the valve clear from weeds and dirt.
WINTERIZING
Drain the valve by disconnecting the tube at the
upstream port of the valve and at any other location
where water can be trapped.

TROUBLESHOOTING
A solenoid converts an electric signal to a hydraulic command
Diaphragm I.D. number can be found on the tip of the diaphragm
Problem Cause Check Remedy
Pressure is too low.
Compare with design
data.
Thickness of diaphragm.
Increase upstream
pressure.
Change to low
pressure diaphragm.
Solenoid (a), incorrect
voltage.
Measure ±10% of nominal
voltage. Check wire sizing.
Correct.
No current Damaged wires. Repair.
Valve does not open
Solenoid (a), faulty
coil.
Voltage okay, but no click. Change coil.
Punctured diaphragm.
Solenoid (a) continuously
discharges water when
valve is open.
Replace diaphragm.
Refer to I.D. number.
Foreign substance on
sealing seat.
Reduced water flow,
noisy.
Dismantle, clean and
reassemble.
Solenoid (a), incorrect
position of the manual
override.
Slot to be horizontal with
arrow pointing down.
Change position.
Solenoid (a), plugged.
Disassemble from valve.
No water from port (c).
Take apart and clean.
Valve does not close
Clogged filter (b).
Disconnect tube
upstream. No firm stream.
Clean or replace.

ELECTRIC VALVE
Normaly Closed
Operating Instructions for 6" – 16" valves
INSTALLATION
The arrow on the bonnet should match the flow direction.
Filter (b) is installed at the upstream side of the valve.
Bolts of flanged valves should be tightened in a diagonal
sequence.
ADJUSTMENTS
The common port of the solenoid base, (2) is
connected to the sensing port (1) of relay (a).
When the solenoid (c) is energized it causes the plunger in the
relay (a) to switch position and port (3) is connected with port
(4), allowing the valve to open.
The opening and closing pace of the valve is adjusted with
needle valves (f2) and (f1). A long mainline requires a longer
opening and closing time and a two stage opening may be
necessary.
With a Normally Open (N.O.) valve, the connections to port # 4
and # 2 of the relay (a) are reversed.
The manual override of the solenoid (c) should be in the Auto
position, the little arrow pointing down.
.
Connection of the wires to the solenoid (c) with 1/2" hub is
described on the attached diagram.
SOLENOID ELECTRICAL WIRE HOOK-UP
Loosen bolt (1). Pull hub assembly off.
Remove (4) and push terminal (3) out with a
screwdriver through access port.
Connect wires to A and B of the terminal block (3). For
DCL solenoids connect negative (black) to A. If no
conduit is used, first put the wires through the
1/2” x 1/4” reducer.
Re-assemble the hub and seal for the access port (4).
MAINTENANCE
WINTERIZING
Drain the valve by disconnecting the tube at the upstream port of
the valve and at any other location where water can be trapped.
Open the needle valves (f1, f2).
a. Relay 66-210
b. Filter 81-1/2"-2
c. NC Solenoid 30-NC
d. Ball Valves 34-1/2"
f. Needle Valves

TROUBLESHOOTING
A solenoid converts an electric signal to a hydraulic command. The relay
Allows fast reaction of large valves and is not susceptible to clogging.
Compare with design
data.
Thickness of
diaphragm.
Increase upstream
pressure.
Change to low pressure
diaphragm.
Needle valve (f2) closed. Open fully. Readjust.
Solenoid (c), incorrect
voltage.
Measure ±10% of
nominal voltage.
Check wire sizing.
Correct.
Solenoid (c), faulty coil.
Voltage okay,
but no click.
Change coil.
Valve does not
open
Relay (a) does not close.
Pressure too low,
need 20 psi.
Increase pressure.
Water keeps flowing
from port #4 of the relay
(a), when valve is open.
Replace diaphragm.
Refer to I.D. #.
sealing seat.
Reduced water flow,
noisy.
reassemble.
Solenoid (c), is clogged.
Disconnect tube at #1
of relay (a). No water
comes from port (c).
Clean.
position of the manual
override.
Slot to be horizontal
with arrow pointing
down.
Change position.
Clogged filter (b).
Disconnect tube
upstream. No firm
stream.
Clean or replace.
Valve does not
close
Needle valve (f1). Closed or dirty.
Open fully, readjust.
Clean or replace.

MANUAL ELECTRIC VALVE
Normaly Closed
Operating Instructions for 1" –6" valves
INSTALLATION
direction.
valve.
style PVC valves.
diagonal sequence.
ADJUSTMENTS
The 3-way selector (a) must be in the A-position.
The O-port is used to manually open and the C-port
to manually close the valve. A neutral position, not
facing any of the ports, locks the water in the bonnet
and can keep the valve in a throttled position.
FOR ELECTRIC OPTION
The common port (2) of the solenoid base (c), is connected
to the A-port of the 3-way selector (a) The top port (p) is
the pressure port for Normally Open (N.O.) solenoids on
Normally Closed (N.C.) valves.
The port marked (1) at the base is the vent port.
Note: A Normally Open valve uses a Normally Closed
solenoid.
For N.O. valves, the connections to the vent (1) and
pressure (p) ports will be reversed!
Start the pump or open the main valve. The valve will
close.
When the solenoid (c) is energized, the water in the
bonnet will vent through the solenoid and the valve opens.
The manual override of the solenoid (c) should be in the off
position.
MAINTENANCE
Turn the handle of the 3-way selector (a) periodically to prevent
sticking.
Verify the downstream pressure periodically with a quality liquid filled
gauge and shrader valve adapter.
WINTERIZING
Drain the valve by disconnecting the tube at the upstream port of the
valve and at any other location where water can be trapped
a. 3-way Selector 35 1/4" / 1/8"
b. Inline filter 81-1/4"-58
c. NO Solenoid 71-NO

TROUBLESHOOTING
A solenoid converts an electric signal to a hydraulic command
The 3-way selector (a)
is in the C position.
Verify knob position. Turn to A position.
Ports are clogged.
Turn 3-way selector
(a) to O or A, no
water.
Dismantle and clean.
Compare with design
data.
Check thickness of
diaphragm.
Increase upstream
pressure.
Change to LP
diaphragm.
voltage.
Measure ±10% of
nominal voltage.
Check wire sizing.
Correct.
Valve does not
open
Solenoid (c), faulty
coil.
Voltage okay, but no
click.
Change coil.
Turn 3-way selector
(a) to port O, water
flows constantly.
Replace diaphragm.
sealing seat.
Reduced water flow,
noisy.
reassemble.
Clogged solenoid (c).
Disconnect at A port,
no water from tube.
Clean solenoid (c).
position of manual
override.
Slot to be horizontal
with arrow
or dot pointing down.
Change position.
Valve does not
close
Clogged filter (b).
Disconnect tube
upstream.
No firm stream.
Clean or replace.

REMOTE CONTROL VALVE
Operating instructions for 1"-4" valves
INSTALLATION
Use primer and heavy duty solvent for the socket style
PVC valves.
sequence.
ADJUSTMENTS
The manual override on the Galit must be in the Auto
position.
The Galit (c) requires a Normally Closed (N.C.) solenoid
at the control panel.
Connect the remote control line, 8 mm to the (1) port of
the Galit (c) after bleeding all the air.
When the solenoid (e) is energized, water in the
hydraulic tube pressurizes and closes the Galit (c), draining
the water from the bonnet through the vent port (4) and the
valve opens.
Depressurizing the hydraulic tubing connects the (3) port
with the (2) port and the bonnet, closing the valve.
The signal line at the Galit (c), when depressurized, should
not have more than 3 mwc (4 psi) of static pressure. The
Galit (c) should not be lower than 3m (9 ft) in elevation
compared to the solenoid (e) at the control panel. If at a
lower level, see the spring selection chart.
MAINTENANCE
Verify the upstream pressure periodically, use a quality liquid
filled gauge and shrader valve adapter.
WINTERIZING
Drain the valve by disconnecting the tube at the access port of
the valve and at (1) port of the Galit (c).
b. Filter 81-1/4"-58
c. GALIT
e. Solenoid 30 NC / 71 NC
Spring Color N.O. Valve N.C. Valve
Yellow 5m – 11m 5m – 11m
Green 11m-15m 11m-16m
White 3m-18m 16m-21m
Red 18m-24m 21m-27m

Remote control using 25-100 –
The 25-100 relay enables accurate adjustments a pilot
valve and is recommended for use where topography
dictates significant altitude differences between solenoid
and main valve.
Adjustment:
The 25-100 requires a N.C. solenoid at the
control panel.
For N.C. main valve: Connect the remote control line,
(8mm) to port (1) of the relay (c) after bleeding
all the air. Connect port (3) to control chamber, port (2) to
upstream, port (4) remains open to atmosphere.
For N.O. main valve: switch connections of (2) and (4)
ports.
N.C. main valve operation: When solenoid (e) is energized,
pressure rises In the hydraulic tube (port (1)) and connects
ports (3) and (4) – valve opens.
When solenoid is de-energized, pressure in port (1) drops
and connects ports (3) and (2) – valve closes.
Spring adjustment: (solenoid de-energized)
Turn adjusting bolt in clockwise direction (tighten) all the way.
Turn the bolt slowly in counter clockwise direction (release) until
water starts bleeding from the vent port of the relay.
Tighten the bolt until bleeding stops and 1/4 turn more.
b. Filter 81-1/4"-58
c. 25-100
e. Solenoid 30 NC / 71 NC
Spring
Color
Pressure ranges
Yellow 7m – 27m
Green 22m-36m
Red 35m-69m

TROUBLESHOOTING
A 25-100 or GALIT relay activated by remote hydraulic command by N.C. solenoid.
The Galit manual
override is in the
Closed position.
Verify knob position. Turn to Auto position.
Ports are clogged.
Turn Galit manual
override to Open or
Auto, no water.
Compare with design
data.
Increase upstream
pressure.
Thickness of
diaphragm.
Change to LP
diaphragm.
Solenoid (e), incorrect
voltage.
Measure ±10% of
nominal voltage.
Check wire sizing.
Correct.
Solenoid (e), faulty
coil.
click.
Change coil.
Check N.C. solenoid. Increase pressure.
Verify connections on
ports.
Correct or clean.
No signal or low
pressure at port (1)
of Galit (c). If green spring was
used.
25-100 – if bolt is
released
Change to yellow
spring.
25-100- release bolt
Broken or damaged
control tubing.
Leaks in the tubing. Repair and bleed air.
Valve does not
open
Faulty Galit (c). Dirt inside. Take apart and clean.
Punctured
diaphragm.
Turn Galit manual
override to port Open
or Auto, water flows
constantly.
Replace diaphragm.
sealing seat.
Reduced water flow,
noisy.
reassemble.
Signal line not
draining due to static
pressure.
Disconnect tube at (1)
port measure
pressure.
Dirt inside. Take apart and clean.
Valve does not
close
Galit (c) not returning
to open position.
Yellow spring is too
weak.
Replace or change to
green spring, or use
25-100

PRESSURE REDUCING VALVE 3-Way
Operating instructions 1" to 6" valves
a. 3-way Selector 35 -1/4" 1/2" - 3
b. Filter 81 – 1/4" - 58
c. Pilot-29-100
d. Shrader Valve
e. Solenoid (option) 71-NO
INSTALLATION
direction.
valve.
style PVC valves.
diagonal sequence.
ADJUSTMENTS
The 3-way selector (a) must be in the A-position. The
O-port is used to manually open and the C-port to
close the valve. A neutral position, not facing any of
the ports, locks the water in the bonnet, used in case
the pilot (c) malfunctions.
Note: The O-port is plugged when the pilot (c) has a
yellow spring, to avoid accidental opening causing high
pressure downstream. The pilot (c) has a colored ring on
the top identifying the spring inside.
Loosen the lock nut and the adjustment bolt on pilot (c).
Start the pump or main valve. Valve opens and
downstream pressure is kept at a low level.
Tighten the bolt of pilot (c) slowly until downstream
pressure reaches the desired level.
Wait until pressure stabilizes, make final adjustments
and tighten the lock nut on the pilot (c).
FOR ELECTRIC OPTION
Turn the manual override of the solenoid (e) 90 degrees and
follow the above steps.
After making the adjustments, turn the override to the original position.
MAINTENANCE
Turn the handle of the 3-way selector (a) periodically to prevent
sticking.
Verify the downstream pressure periodically with a quality liquid
filled gauge and shrader valve adapter.
WINTERIZING
Drain the valve by disconnecting the tubes at the access
ports of the valve and at any other location where water
can be trapped.

PRESSURE REDUCING VALVE
3-Way
The 3-way selector (a) is
in the C position.
Ports are clogged.
Turn 3-way selector (a) to
O or A, no water.
Compare with design
data.
Increase upstream
pressure.
Check thickness of
diaphragm.
Change to LP
diaphragm.
voltage.
Measure ±10% of nominal
voltage. Check wire
sizing.
Correct.
Faulty coil. Voltage okay, but no click. Change coil.
Valve does not open
Faulty pilot (c).
Disconnect tube at port A.
Water keeps flowing out.
Repair or replace.
Turn 3-way selector (a) to
port O, water flows
constantly.
Replace diaphragm.
sealing seat.
Reduced water flow,
noisy.
reassemble.
Solenoid (e) is clogged.
Disconnect tube at A port,
no water comes out.
Clean solenoid (e).
Valve does not close
Solenoid (e) incorrect
position of manual
override.
arrow or dot pointing
down.
Change position.
Incorrect connections. Compare with schematic. Change accordingly.
Wrong spring in pilot (c).
Check data, yellow spring
5-25 mwc (7-35 psi)
downstream.
Change to green
spring10-45 mwc
(14-70 psi).
Inlet pressure too low. Measure, check design. Increase pressure.
Clogged filter (b).
Disconnect tube
upstream, no firm stream.
Clean or replace.
Valve does not
regulate
Faulty pilot (c).
Disconnect tube at port 2,
no water coming out.
Clean pilot or replace.
Valve has low pressure
diaphragm.
Noisy, chattering, high
pressure differential.
Check diaphragm I.D.
Use high pressure
diaphragm.
Unstable
performance
Low flow or high pressure
differential.
Valve is surging.
Install dripper or needle
valve at
vent port (3) and/or port
A.

3-Way
a. 3-way Selector 35-1/4" – 3 / 6
b. Filter 81-1/2"- 2
c. Pilot-Brass 31-310
d. Ball Valves 34 –/ 1/2"
e. Solenoid (option) 30- NC
f. Pressure gauge
INSTALLATION
direction.
Use primer and heavy duty solvent for the socket style
PVC valves.
diagonal sequence.
ADJUSTMENTS
The 3-way selector (a) must be in the A-position. The
O-port is used to manually open and the C-port to
close the valve. A neutral position, not facing any of
the ports locks the water in the bonnet, used in case
the pilot (c) malfunctions.
The isolation ball valves (d) at the access ports of the
valve must be open.
Loosen the lock nut and the adjustment bolt on
pilot (c).
Tighten the bolt of pilot (c) slowly until downstream
pressure reaches the desired level.
and tighten the lock nut on the pilot (c).
FOR ELECTRIC OPTION
Turn the manual override of the solenoid (f) 90
degrees and follow the above steps.
After making the adjustments, turn the override to the original position.

SOLENOID ELECTRICAL WIRE HOOK-UP
• Loosen bolt (1). Pull hub assembly off.
• Remove (4) and push terminal (3) out with a
screwdriver through access port.
• Connect wires to A and B of the terminal block (3).
For DCL solenoids, connect negative (black) to A.
If no conduit is used, first put the wires through
the1/2” x 1/4” reducer.
• Re-assemble the hub and seal for the
access port (4).
MAINTENANCE
Turn the handle of the 3-way selector (a) periodically to
prevent sticking.
Verify the downstream pressure periodically with a
quality liquid filled gauge and shrader valve adapter.
WINTERIZING
Drain the valve by disconnecting the tube at the
upstream port of the valve and at any other location
where water can be trapped.

TROUBLESHOOTING
Pressure reducing valve reduces inlet pressure to steady pre-determined
downstream pressure. A solenoid converts an electric signal to a hydraulic
command. Diaphragm I.D. number can be found on the tip of the diaphragm
The 3-way selector (a)
is in the C position.
Selector ports are
clogged.
Turn 3-way selector (a)
to O or A, no water.
Compare with design
data.
Increase upstream
pressure.
Check thickness of
diaphragm.
Change to LP
diaphragm.
voltage.
Measure ±10% of
nominal voltage. Check
wire sizing.
Correct.
Faulty coil.
click.
Change coil.
Valve does not open
Faulty pilot (c).
Disconnect tube at port
A. Water keeps flowing
out.
Repair or replace.
Turn 3-way selector (a)
to port O, water flows
constantly.
Replace diaphragm.
sealing seat.
Reduced water flow,
noisy.
reassemble.
Solenoid (e) is clogged.
Disconnect tube at A
port, no water comes
out.
Clean solenoid (e).
Valve does not
close
Solenoid (e) incorrect
position of manual
override.
arrow or dot pointing
down.
Change position.
Incorrect connections.
Compare with
schematic.
Change accordingly.
Wrong spring in pilot
(c).
Check data, yellow
spring 5-30 mwc (7-35
psi) downstream.
Change to green
spring 10-60 mwc (14-
70) psi.
Inlet pressure too low. Measure, check design. Increase pressure.
Clogged filter (b).
Disconnect tube
upstream, no firm
stream.
Clean or replace.
Valve does not
regulate
Faulty pilot (c).
Disconnect tube at port
3, no water coming out.
Clean pilot or replace.
Valve has low pressure
diaphragm.
Noisy, chattering, high
Check diaphragm I.D.
Use high pressure
diaphragm.
Unstable
performance
Low flow or high
Valve is surging.
Install dripper or
needle valve at
vent port (2) and/or
port A.

PRESSURE REDUCING SUSTAINING
VALVE 3-WAY
a. 3-way Selector 35-1/4" 3 / 6
b. Filter 81-1/2" - 58
c. Reducing Pilot 31-310
d. Ball Valve 34- /1/2"
g. Sustaining Pilot 31-300
INSTALLATION
Filter (c) is installed at the upstream side of the valve.
sequence.
ADJUSTMENTS
The 3-way selector (a) must be in the A-position. The O-port
is used to manually open and the C-port to close the valve.
A neutral position, not facing any of the ports, locks the
water in the bonnet, used in case the pilots (c, g)
malfunction.
Note: The pilots (c, g) have a colored ring on the top
identifying the spring inside.
Loosen the lock nut and tighten the adjustment bolt of both
pilots (c) and (g).
Start the pump or open main valve. Valve remains closed
or opens slightly maintaining a high upstream pressure.
Loosen the bolt of pilot (g) slowly until upstream
Pressure reaches the desired level.
Loosen the bolt of pilot (c) slowly until the
downstream reaches the required pressure level.
and tighten the lock nut on both pilots (c, g).
MAINTENANCE
Turn the handle of the 3-way selector (a) periodically
to prevent sticking.
Verify the correct setting of the pilots (c, g)
periodically with a quality liquid filled gauge and
shrader valve adapter, by measuring the up and
downstream pressure.
WINTERIZING
Drain the valve by disconnecting the tubes at the access
ports of the valve and any other location where water can
be trapped.

TROUBLESHOOTING
Pressure reducing pilot reduces inlet pressure to steady pre-determined downstream
pressure. Pressure sustaining pilot maintains a minimum upstream pressure. A
solenoid converts an electric signal to a hydraulic command. Diaphragm I.D. number
can be found on the tip of the diaphragm
The 3-way selector
(a) is in the C
position.
Ports are clogged.
Turn 3-way selector
(a) to O or A, no water
flowing.
Compare with design
data.
Increase upstream
pressure.
Valve does not
open
Faulty pilot (c).
Disconnect tube (c3).
Tube keeps venting
water.
Repair or replace.
Turn 3-way selector
(a) to port O, water
flows constantly.
Replace diaphragm.
Refer to I.D. number.Valve does not
close
sealing seat.
Reduced water flow,
noisy.
reassemble.
Incorrect connections.
Compare with
schematic.
Change accordingly.
Wrong spring in
pilot (c).
Check data, yellow
spring 5-25 mwc (7-
35 psi) downstream.
Change to green
spring 10-47 mwc (14-
70 psi).
Inlet pressure too low.
Measure, check
design.
Increase pressure.
Clogged filter (b).
Disconnect tube
upstream, no firm
stream.
Clean or replace.
Valve does not
regulate
Faulty pilot (c).
Disconnect tube at
port (c3), no water
coming out.
Clean pilot (c) or
replace.
Pilot set points are too
close together,
causing interference.
Set points of pilots
(c, g) to be a
minimum of 10 psi
apart.
Change accordingly.
Unstable
performance
Low flow or high
Valve is surging.
Install needle valve
between (c3) and A
port of 3-way selector
(a).

3-WAY QUICK REACTING
a. Pilot Quick-Reacting 66-310
b. Pilot-Brass 31-310
c. Filter 81-1/2"-58
d. Ball Valves 34- 1/2"
INSTALLATION
Filter (c) is installed at the upstream side of the valve.
sequence.
ADJUSTMENT
The isolation ball valves (d) at the access ports of valve
must be open.
Loosen the lock nut and the adjustment bolt on pilot (a).
Tighten the bolt on pilot (b).
Tighten the bolt of pilot (a) slowly until downstream
pressure reaches the desired level at which the valve will
react quickly.
Wait until pressure stabilizes, make final adjustments and
loosen the lock nut on the pilot (b).
Loosen the bolt on pilot (b) until the downstream pressure
reaches the required level for normal regulation and
tighten the bolt about two turns. The set point of the bolt on
pilot (a) should be at least 7 mwc (10 psi) higher than the
one on pilot (b).
MAINTENANCE
Verify the downstream pressure periodically with a quality
liquid filled gauge and shrader valve adapter.
WINTERIZING
Drain the valve by disconnecting the tube at the access ports
of the valve and at other locations where water can be
trapped.

TROUBLESHOOTING
Pressure reducing valve reduces inlet pressure to steady pre-determined downstream
pressure. Quick reacting pilot closes the valve fast as pressure exceeds it set point..
Valve does not
open
Incorrect pilot (b)
connections.
Compare to
diagram.
Make corrections.
Punctured
diaphragm.
Pilots (a, b) do not
regulate.
Replace diaphragm
Refer to I.D. #.Valve does not
close Foreign substance
on sealing seat.
Reduced water
flow, noisy.
reassemble.
Incorrect
connections.
Compare with
schematic.
Change accordingly.
Wrong spring in
pilot (b).
Check data, yellow
spring 5-20 mwc
(7-30psi)
downstream.
Change to green spring
10-70 mwc (14-100 psi)
or red spring 20-130 mwc
(30-190 psi).
Inlet pressure too
low.
Measure, check
design.
Increase pressure.
Clogged filter (c).
Disconnect tube
upstream. No firm
stream.
Clean or replace.
Valve does not
regulate
Faulty pilot (b).
Disconnect tube at
port-3, of pilot (b),
no water coming
out.
Clean pilot (b) or replace.

PRESSURE REDUCING
REMOTE CONTROL VALVE
a. Pilot (sizes 1" to 4") 29-100
Pilot (sizes 6" to12") 31-310
b. GALIT GALIT
c. Filter 81- 1/4" 1/2" -58
Red port numbers refer to
Pilot valve 31-310 installation
INSTALLATION
The valve can be installed in any position, but flow direction
should match the engraved arrow on the bonnet.
Connect port (1) of the GALIT relay (b) to the control center by a
PE command tube, 6 mm size is preferred.
Drain the air from the command tube - air in the tube will cause
delay in activation of the relay.
ADJUSTMENTS
Turn the adjusting bolt (1) of the Pilot (a) in a counterclockwise
direction all the way.(loosening)
Start the pump or open the main valve of the network.
Turn the adjusting bolt (1) of the Pilot (a) in a clockwise direction
until the downstream pressure reaches the required set point.
Elevation difference between the controller and the valve may
require inserting a spring in the Galit (b) to overcome the static
pressure in the control tube.
MAINTENANCE
For Normally Closed Valves - Turn the handle
of the relay to the "C", closed position for
manual opening. The valve will perform as a
Pressure reducer at this position. For Normally
Open Valves - Turn the handle of the relay to
the "O", open position for manual opening.
The valve will perform as a Pressure Reducer
at this position. Return the handle to the "A",
auto position for normal remote control of the
valve.
WINTERIZING
Check and clean the in-line filter as water quality
dictates. Unless the water is very dirty, this service
should not be done more than once in a few months.
Watch the valve performance by checking the
downstream pressure gauge periodically

Designer and operator manual dorot

Designer and operator manual dorot

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