Pneumatic Directional Control Valve Symbols

2 2 way valve 2 connections 2 switching positions for 2 flow directions actuation by pressing spring return normally closed.

Pneumatic directional control valve symbols.

Symbols identification and other circuit symbols. 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. 5 3 way single pilot pneumatic valve pneumatically actuated in both. 5 way directional control valves figures 8 16 through 8 20 show symbols of some 5 way air valves.

This means they have two flow pipe connections and can switch into two different positions. Basic check valves allow fluid to flow in one direction but prevent fluid from flowing in the opposite direction. The top symbol shows a manually activated valve that is pushed over against a spring. Because air usually exhausts to atmosphere the extra exhaust port is no problem.

Pneumatic circuit symbols representing these valves provide detailed information about the valve they represent. The double arrow in the left box shows that the flow may pass in both directions. Most spool type air valves come in a 5 way configuration. 4 way 2 position direct solenoid operated spring return.

Perhaps the simplest of all directional control valves is the check valve a specific type of binary valve. As with all fluid power components directional control valves can be represented by standard symbols published in iso 1219. The valves shown are all two way two position directional valves.