Functions and features of pneumatic valves

Pneumatic valves control the path of the compressed air. The direction of flow is indicated by an arrow. Actuation can take place manually, mechanically, pneumatically or electrically. Automated systems generally use solenoid-actuated valves that form the interface between pneumatic and electrical control. They are switched by means of the output signals from the signal control section and shut off or open connections in the pneumatic power section. The main functions of electrically-actuated directional control valves include:

• connecting or shutting off the compressed air supply,

• retracting and advancing cylinder drives.