2 Ports 2 Positions |
3 Ports 2 Positions |
4 Ports 2 Positions
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4 Ports 3 Positions |
5 Ports 2 Positions |
5 Ports 3 Positions |
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Flow One Direction |
Flow Two Directions |
Spring Closed
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Spring Return
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Double Acting Double Rod |
Double Acting Single Fixed Cushion |
Double Acting Two Adjustable Cushions |
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and Regulators |
Automatic Drain |
Manual Drain |
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and Two Closed Ports |
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External |
Internal |
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Actuated Switch |
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Non Relieving |
Self Relieving |
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Connect Coupling |
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and One Transitory Centre Position |
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and One Closed Port
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with Cross Connection
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Pump
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The following symbols are generally in accordance with BS1553-1 and BS5070
Different Line Types.
Pipe Support Symbols
Symbols for fitting and representations.
Symbols for Valves
Symbols for Valve Actuators
Symbols for Instruments
Symbols for Flow Instruments
Instrument Indentifiers
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 |
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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
Equipment Process Plant - 3
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 energized 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) SymbolPneumatic 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 “at Rest” position of the solenoid valve. The spring “pushes” 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 symbolThis symbol indicates the air supply port, in addition to this the letter P or the number 1 also indicated the air supply port.