Common Solenoid Valve and other Pneumatic symbols.

A detailed view of pneumatic circuit symbols and their meaning. Valve symbols including solenoid valve symbols are those that are in common use. Solenoid Valve Symbols:

2/2 valve - 2 ports 2 positions	3/2 valve - 3 ports 2 positions	4/2 valve - 4 ports 2 positions	5/2 valve - 5 ports 2 positions	5/3 valve - 5 ports 3 positions
Accumulator	Air Dryer	Air Motor - flow one direction	Air motor - flow two directions	Check Valve - spring closed
Compressor	Cylinder - Spring return	Cylinder - Double Acting with double rod	Cylinder - Double acting with single fixed cushion	Cylinder - Double acting with two adjustable cushions
Differential pressure	Direction of flow	Exhaust Line - control line	Filters and Regulators	Filter with automatic drain
Filter with manual drain	Fixed restriction	Flexible hose line	Flow control valve	Flow Gauge
Lever	Line Connected	Lines crossing	Lubricator	Muscular Control
One bypass flow valve and two closed ports	One flow path	Pedal or treadle	Pilot pressure - external	Pilot pressure - Internal
Plugged Port	Plunger or Position Indicator	Pneumatic	Pressure Actuated Switch	Pressure Gauge
Pressure Regulator - Non Relieving	Pressure Regulator - Self Relieving	Push Button	Quick Connect Coupling	Roller
Roller One Way	Shuttle Valve	Silencer	Solenoid with pilot and manual over ride	Solenoid - Single Winding
Spring	Two Closed Ports	Two distinct positions and one transitory position	Two flow paths	Two flow paths with cross connection
Vacuum Pump	Variable Restriction	Working Line

The following symbols are generally in accordance with BS1553-1 and BS5070Different Line Types.

Symbols for Valves

Symbols for Valve Actuators

Symbols for Instruments

Symbols for Flow Instruments

Instrument Identifiers

Measured Variable	Type of Conditioner	Type of 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		Connexion Solenoid Valve symbols from the UK's premier solenoid valve suppliers Symbols for Process Equipment

The levels of detail for process equipment relates to the schematic type produced. A process flow sheet will only show basic levels of technical information sufficient to highlight essential process flow paths. An engineering line diagram of P and ID will show a lot more detailed comprehensive information and technical detail.

Equipment Process Plant -1

Equipment Process Plant - 2

Line tags and equipment identification.

Reading Pneumatic Schematic Symbols

5/2 Valve has 5 ports and 2 possible conditions

1.) B is pressurized and A is exhausted.
2.) A is pressurized and B is exhausted.

When the solenoid is NOT energised the B port is pressurized. The spring symbol defines the valve position at rest.

The Block

The block symbolizes the possible valve functions or positions. Example: A 5/2 valve schematic will be illustrated with 2 blocks describing two valve functions or positions/ A 5/3 valve schematic will show three blocks describing 3 possible valve functions.

The Actuator.

(Solenoid) Symbol

Pneumatic valves can be operated in several ways. Hand operated (including levers and push and or push pull buttons) : Air piloted (operated remotely by pneumatic signals) : Solenoid (directly actuated with electronic signals)

Exhaust Port Symbol

The inverted triangle symbol Denotes an exhaust port. The letters EA indicate this is the exhaust port for the A circuit. Ebin turn indicated the exhaust port for the B circuit.

The Arrows

The arrow symbols illustrate the direction of gasses flowing into and out of the valve ports. Gas pressure is supplied from port P. Depending on which of the valve blocks is in function, the gas is directed to port A or B as shown by the arrows.

The return spring

The spring symbol defines the â€œat Restâ€ position of the solenoid valve. The spring â€œpushesâ€ from the side it is drawn on and places the right side block diagram of the valve in function.

The T Symbol

This symbol indicates that a port is closed and is neither passing or exhausting gas.

Pressure of air supply symbol

This symbol indicates the air supply port, in addition to this the letter P or the number 1 also indicated the air supply port.

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