Directional-control valves are vital in any pneumatic circuit, directing or blocking airflow to control the speed or sequence of operations. One method of classifying directional-control valves is ...

Pneumatic Control Valves (PDF Download) April 8, 2016 Directional-control valves are vital in any pneumatic circuit, directing or blocking airflow to control the speed or sequence of operations.

In a pneumatic circuit, a 3/2 valve directs compressed air to extend or retract a cylinder. When the valve is in the actuated position, air flows to the cylinder, causing it to extend/outstroke.

Without pneumatic circuit design and schematic symbols, designers would not be able to communicate to an engineer the necessary component placement in order to achieve the work for a particular job.