Pneumatic Control Valve Symbol

Pneumatic valves description flow control.

Pneumatic control valve symbol.

Symbols identification and other circuit symbols. 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. In the hydraulic valve fluid is returned to the tank from port t.

In both the load is connected to ports labeled a b and the pressure supply from pump or compressor to port p. 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. These details may include the size function pressure rating and connection type of the valve. Directional air control valves are the building blocks of pneumatic control.

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. Symbols show the methods of actuation the number of positions the flow paths and the number of ports. An engineer may also include specific details below the control valve symbol. Symbol description a position 2 wav s way 4 way 2 position 4 way way pot.

A close study of most air logic control circuits will reveal that there are only six basic valve functions commonly used. 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. Air preparation units pneumatic valves cont d valve actuators symbol descrlptlon filter separator. The symbols for these valve functions are shown in left graphic.

Most control valves however have four ports shown in hydraulic and pneumatic forms in figure 4 1. These six basic valve symbols when combined with the basic actuator symbols comprise virtually all the directional valve symbols needed for air logic control.