The following symbols are generally in accordance with BS 1553-1...and BS 5070
Different Line Types.
Different Pipe Supports.
Symbols for Fitting and Representations.
Symbols for Valves
Symbols for Valve Actuators.
Symbols for Instruments.
|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 level of detail for the equipment relates to the type of schematic being produced. A Process Flow Sheet will only show the basic level of information sufficient to show the essential process flowpaths. An Engineering Line Diagram of P & ID drawing will show a much more detailed representation.
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 isexhausted.
2.) A is pressurized and B isexhausted.
When the solenoid is NOT energized the B port ispressurized. The spring symbol defines the valve position at rest.
The block symbolizesthe possible valve functions or positions. Example: A 5/2 valve schematic willbe illustrated with 2 blocks describing two valve functions or positions/ A 5/3valve schematic will show three blocks describing 3 possible valve functions.
Pneumatic valves canbe operated in several ways. Hand operated (including levers and push and orpush pull buttons) : Air piloted (operated remotely by pneumatic signals) :Solenoid (directly actuated with electronic signals)
Exhaust Port Symbol
The invertedtriangle symbol Denotes an exhaust port. The letters EA indicate this is theexhaust port for the A circuit. Ebin turn indicated the exhaust port for the Bcircuit.
Thearrow symbols illustrate the direction of gasses flowing into and out of thevalve ports. Gas pressure is supplied from port P. Depending on which of thevalve blocks is in function, the gas is directed to port A or B as shown by thearrows.
The return spring
Thespring 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 diagramof the valve in function.
The T Symbol
Thissymbol indicates that a port is closed and is neither passing or exhaustinggas.
Pressure of air supply symbol
This symbol indicates the air supply port, inaddition to this the letter P or the number 1 also indicated the air supplyport.