A solenoid valve is an electro-mechanical valve for use with instrumentation-AIR. The valve is controlled by passing an electric current through a solenoid: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports.
A solenoid valve has two main parts: the solenoid and the valve. The solenoid converts electrical energy into mechanical energy which, in turn, opens or closes the valve mechanically. A direct acting valve has only a small flow circuit, this is referred to below as a PILOT VALVE.
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