1. At the end of this chapter we should able to:
•Identify the main function of a solenoid.
•Identify the application of solenoid.
•Describe the application of solenoid with operating
valves.
•Draw the symbol of a solenoid with a standard
symbol.
•Draw a control circuit showing the energizing of a
solenoid through the closing of relay contact, using a
control relay, two push button switches and a solenoid.

3. Solenoid is an electromechanical
device
Electrical energy is used to magnetically
cause mechanical movement

6. Single Solenoid Spring Return Valve
 Operating the START push-button switch close the circuit
to the coil of relay ICR.
 The coil is now energized.
 Relay contact 1CR-1 then closes, interlocking around the
START push-button switch.
 Contact 1CR-2 closes, energizing solenoid A.
 The circuit can be de-energized by operating the
REVERSE push-button switch.
1 CR-1
START
REV
1
CR
1 3 4 2
1 CR-2
SOL A
1 5 2

7. Single Solenoid Spring Return Valve
 Time-delay relay is added.
 Operating the START push button switch closes the
circuit to the coil of relay 1 CR.
 The coil is now energized.
 Contact 1 CR-1 closes, interlocking around the
START push button switch.
 Contact 1CR-2 closes, energizing solenoid 1A.
 Contact 1CR-3 closes, energizing the coil of timing
relay 1TR.
 After a time delay, as set on the timing relay, the
timing constant contact closes, energizing solenoid
1B.
 The circuit can be de-energized by operating the
REVERSE push button switch.

9. Applied in many electrical activated devices such as
Valves
Locks
Punches
Marking machines

11. Common Rotary Solenoid
 Circuit breakers
 IC insertion machines
 Defibrillators
 Textile machinery
 Automatic tellers
 Film processors
 Machine tools
 Pinch rollers
 Brakes
 Ticket machines
 Copiers

13. Common Linear Solenoid
 Vending machines
 Brakes
 Copiers
 Door locks
 Pumps
 Interposers
 Coin changers
 Film processors
 Disk drive locks
 Electronic typewriters

14. Symbol of Solenoid
Symbol of Solenoid

16. MAGNETIC FIELD LINES

17.  Solenoids converts electrical energy to
mechanical work.
 Different types of solenoids for different
types of applications.