Pneumatic Control Valve Symbol

These six basic valve symbols when combined with the basic actuator symbols comprise virtually all the directional valve symbols needed for air logic control.

Pneumatic control valve symbol.

An engineer may also include specific details below the control valve symbol. Pneumatic circuit symbols explained. Symbol description a position 2 wav s way 4 way 2 position 4 way way pot. These details may include the size function pressure rating and connection type of the valve.

In both the load is connected to ports labeled a b and the pressure supply from pump or compressor to port p. For example the note 2 300 rf pb indicates that the p id calls for this valve to be a 2 ansi 300 raised face piston balanced valve. A close study of most air logic control circuits will reveal that there are only six basic valve functions commonly used. Bidirectional flow control bidirectional control valve symbols are the same as unidirectional but without the check valve indicating that the air is restricted in either direction.

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. In the pneumatic valve return air is vented from port r. Symbols show the methods of actuation the number of positions the flow paths and the number of ports. Directional air control valves are the building blocks of pneumatic control.

5 3 way single pilot pneumatic valve pneumatically actuated in both directions spring centred exhausted in mid position 1 2 3 4. Symbols identification and other circuit symbols. Pneumatic valves description flow control. Air preparation units pneumatic valves cont d valve actuators symbol descrlptlon filter separator.

The symbols for these valve functions are shown in left graphic. In the hydraulic valve fluid is returned to the tank from port t.