A solenoid valve is an electromechanical valve for use with gas or liquid. The valve is controlled by an electrical current through a solenoid coil.
Solenoid valves may have at least two ports: in the event of a two-port valve the flow is switched off or on; in the event of a three-port valve, the outflow is changed between the two outlet ports. Multiple solenoid valves can be put together on a manifold.
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Solenoid valves are the most frequently used control components in fluidics. Their tasks are to close off, discharge, dose, distribute or mix fluids. They’re located in several application areas. Solenoids offer fast and secure switching, higher reliability, long service life, fantastic moderate compatibility of the materials used, low control power and compact design.
Aside from the plunger-type actuator that’s used most often, pivoted-armature actuators and rocker actuators can also be used.
A solenoid valve has two major components: the solenoid and the valve. The solenoid converts electrical energy to mechanical energy that, in turn, opens or closes the valve automatically. A direct acting valve has only a small flow circuit, shown within section E of the diagram (this segment is cited below as a pilot valve). This diaphragm valve multiplies this little flow by using it to control the flow through a much larger orifice.