Pneumatic Directional Control Valve Symbols

Most spool type air valves come in a 5 way configuration.

Pneumatic directional control valve symbols.

5 3 way single pilot pneumatic valve pneumatically actuated in both. The valves shown are all two way two position directional valves. Symbols identification and other circuit symbols. The double arrow in the left box shows that the flow may pass in both directions.

Perhaps the simplest of all directional control valves is the check valve a specific type of binary valve. Pneumatic symbols directional control valves process valves description image description image 2 2 way valve air operated nc angle valve 2 way 2 2 way valve direct operated nc ball valve 2 way 2 2 way valve pilot operated nc ball valve 3 way l 3 2 way valve air operated nc ball valve 3 way t. Here is a brief breakdown of how to read a symbol. Symbols show the methods of actuation the number of positions the flow paths and the number of ports.

The top symbol shows a manually activated valve that is pushed over against a spring. 5 way directional control valves figures 8 16 through 8 20 show symbols of some 5 way air valves. Basic check valves allow fluid to flow in one direction but prevent fluid from flowing in the opposite direction. Pneumatic circuit symbols representing these valves provide detailed information about the valve they represent.

Because air usually exhausts to atmosphere the extra exhaust port is no problem. As with all fluid power components directional control valves can be represented by standard symbols published in iso 1219. 4 way 2 position direct solenoid operated spring return.