Pneumatics, Hydraulics - Valves and Control

Pneumatic and hydraulic devices control the flow of air or inert gases and liquids, respectively, to actuators that convert the flow displacement into mechanical motion. Amplifier and control relays, momentary and maintained valves, flow restrictors, frequency and impulse generators, timers, vacuum generators and switches and solenoid valves make up the devices used to control and direct the flow to the actuators.