Pneumatic Control Valve Symbol

Symbols show the methods of actuation the number of positions the flow paths and the number of ports.

Pneumatic control valve symbol. Pneumatic valves description flow control. Air preparation units pneumatic valves cont d valve actuators symbol descrlptlon filter separator. A close study of most air logic control circuits will reveal that there are only six basic valve functions commonly used. In the pneumatic valve return air is vented from port r.

5 3 way single pilot pneumatic valve pneumatically actuated in both directions spring centred exhausted in mid position 1 2 3 4. Pneumatic circuit symbols representing these valves provide detailed information about the valve they represent. The symbol depicts a non return or check valve which restricts the air supply so that it air is restricted in one direction and free flowing in the other direction. 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.

Pneumatic circuit symbols explained. These six basic valve symbols when combined with the basic actuator symbols comprise virtually all the directional valve symbols needed for air logic control. In the hydraulic valve fluid is returned to the tank from port t. The symbols for these valve functions are shown in left graphic.

These details may include the size function pressure rating and connection type of the valve. Symbols identification and other circuit symbols. 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. Most control valves however have four ports shown in hydraulic and pneumatic forms in figure 4 1.

In both the load is connected to ports labeled a b and the pressure supply from pump or compressor to port p. 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.