Solenoid Valve Symbols

Solenoid Valve and Common Pneumatic System Symbols.

Understanding ANSI / ISO Schematic Symbols for fluid power and pneumatic components are used to identify and graphically denote the function and operation of piped control systems. Understanding schematic symbols will help to better understand at a glance the application, control, direction, amount of flow for actuated valves, cylinders and rotary actuators.

Basic Symbols.

Valve position symbol Square or rectangular block specify a valve position.
Two position valve symbol Two square or rectangular blocks specify the valve has two possible positions
Three position valve symbol Three square or rectangular blocks specify the valve has three possible positions
Valve Flow symbol Arrows specify the direction of flow, in this case in one direction, if a line has an arrow at each end then the flow is bi-directional or flow in both directions.
Valve symbol for closed port Symbol for closed port.
Valve symbol two port valve both ports closed Symbol for two port valve with both ports closed.
Valve return spring Symbol for spring or rest position of valve. The spring pushes from the side that is drawn on and will return the valve back to its failsafe position.
Pressure inlet port Symbol for pressure inlet port of valve.
Valve symbol 2 way 2 positions open Symbol for 2 port valve with two positions, one position valve open with flow in both directions or valve closed with both ports blocked.
Symbol for 3 port valve 2 positions Symbol for 3 port valve with 2 positions.

A Symbols

Symbol for accumulator Accumulator
Symbol for air dryer Air Dryer
Air motor flow in one direction Air motor flow in one direction
Air motor flow in two directions Air motor flow in two directions

C Symbols

Check valve spring loaded Check valve spring loaded
Compressor Compressor
Cylinder spring return Cylinder spring return
Cylinder double acting double rod Cylinder double acting double rod
Cylinder double acting single fixed cushion Cylinder double acting single fixed cushion
Cylinder double acting two adjustable cushions Cylinder double acting two adjustable cushions

D Symbols

Differential pressure Differential pressure
direction of flow direction of flow

E Symbols

Valve Exhaust Line or control line Exhaust Line or control line

F Symbols

Filters and Regulators Filters and Regulators
Filter with automatic drain Filter with automatic drain
Filter with manual drain Filter with manual drain
Fixed restriction Fixed restriction
Flexible hose line Flexible hose line
Flow control valve Flow control valve
Flow gauge Flow gauge

L Symbols

Lever symbol Lever
Lines connected Lines connected
Lines crossing Lines crossing
Lubricator Lubricator

M Symbol

Muscle control Muscular control

O Symbol

One bypass flow path and two closed ports One paypass flow path and two closed ports
One flow path One flow path

P Symbol

Pedal or Treadle Pedal or Treadle
Pilot pressure external Pilot pressure external
Pilot pressure internal Pilot pressure internal
Plugged or blocked port Plugged or blocked port
Plunger or position indicator Plunger or position indicator
Pneumatic Pneumatic
Pressure actuated switch Pressure actuated switch
Pressure gauge Pressure gauge
Pressure regulator adjustable non relieving Pressure regulator adjustable non relieving
Pressure regulator adjustable self relieving Pressure regulator adjustable self relieving
Push button Push button

Q Symbols

Quick connect coupling Quick connect coupling

R Symbols

Roller Roller
Roller one way Roller one way

S Symbols

Shuttle valve Shuttle valve
Silencer Silencer
Solenoid and pilot Manual over ride Solenoid and pilot Manual over ride
Solenoid with single winding Solenoid with single winding
Spring Spring

T Symbols

Two closed ports Two closed ports
Two distinct positions and one transitory centre position Two distinct positions and one transitory centre position
Two flow paths Two flow paths
Two flow paths and one closed port Two flow paths and one closed port
Two flow paths with cross connection Two flow paths with cross connection

V Symbols

Vacuum pump Vacuum pump
Variable restriction Variable restriction

W Symbols

Working line

Working line

Basic Valve Symbols.

2/2 valve 2 ports 2 positions

2/2 Way Valve

2 ports 2 positions

3/2 valve 3 ports 2 positions

3/2 way valve

3 ports 2 positions

4/2 valve 4 ports 2 positions

4/2 way valve

4 ports 2 positions

4/3 valve 4 ports 3 positions

4/3 way valve

4 ports 3 positions

5/2 valve 5 ports 2 positions

5/2 way valve

5 ports 2 positions

5/3 valve 5 ports 3 positions

5/3 way valve

5 ports 3 positions

Mechanical valve symbols.

Mechanical valve symbols

Basic Valve Symbols.

Common Valve Symbols.

3 way plug valve 3 way plug valve
Angle valve hand operated Angle valve hand operated
Angle valve Angle valve
Ball valve Ball valve
Bleeder valve Bleeder valve
Butterfly valve Butterfly valve
Check non return valve Check non return valve
Check valve Check valve
Control valve Control valve
Diaphragm valve Diaphragm valve
Flange valve Flange valve
Flanged valve Flanged valve
Float operated valve Float operated valve
Four way valve Four way valve
Gate valve hand operated Gate valve hand operated
Gauge Gauge
Globe valve hand operated Globe valve hand operated
Globe valve Globe valve
Hydraulic valve Hydraulic valve
Motorised valve Motorised valve
Needle valve Needle valve
Plug Cock valve Plug Cock valve
Powered valve Powered valve
Pressure relief valve Pressure relief valve
Pressure sustaining valve Pressure sustaining valve
Solenoid valve Solenoid valve

Solenoid control valves that change valve position Open/Close etc by direct movment from a solenoid are called Direct Acting.

Solenoid control valves that change position Open/Close etc by opening small pilot circuits allowing pressurised air, fluid or gas to move the valve are called pilot operated or servo pressure assisted valves.

Two way and three way valves with a mechanical return spring that automatically return the valve back

to the rest position are called normally closed (failsafe closed) or normally open (failsafe open).

two position two way normally open plunger operated valve with spring return

two position two way normally open plunger operated valve with spring return
Two position two way normally closed direct solenoid operated valve with pring return Two position two way normally closed direct solenoid operated valve with pring return

Instrument Identifiers.

Measured Variable Type Component
F = Flow R = Recorder T = Transmitter
L = Level I = Indicator M = Modifier
P = Pressure C = Controller E = Element
Q = Quantity A = Alarm
T = Temperature

Actuators.

Actuators provide clamping, movement, rotation, turn and position from fluid power, pneumatic and hydraulic circuits. Powered by pneumatic air or hydraulic lines.

Cylinders.

Cylinders provide linear movements powered by pneumatic air lines..

Rotary Actuators.

Rotary actuators provide rotational force to actuate ball, butterfly, gate and globe valves. These can be quarter turn, half turn, full turn and multi turn actuators powered by pneumatic or hydraulic lines.

Air Motors.

Air motors provide continuous fast rotation and are powered by pneumatic air lines.

Process equipment symbols plant 1

Process equipment symbols plant 1

Process equipment symbols plant 2

Process equipment symbols plant 2

Process equipment symbols plant 3

Process equipment symbols plant 3

Line Tags and Equipment Indentification.

Line tags and equipment identification

Process equipment details and drawings relate to the type of schematic drawing provided. Typically a process flow schematic drawing will provide basic levels of technical information to highlight basic essential flow control and flow paths. An engineering line diagram of P and ID will show more detailed and precise information.