In the de-energized condition, a seat orifice is closed, which opens when the valve is energized With a direct-acting solenoid valve, the seat seal is attached to the solenoid core. A further distinguishing feature is the number of port connections or the number of flow paths ("ways"). When de-energized, the plunger or pivoted armature is returned to its original position by the spring action.Īccording to the mode of actuation, a distinction is made between direct-acting valves, internally piloted valves, and externally piloted valves. When energized, a magnetic field builds up which pulls a plunger or pivoted armature against the action of a spring. The actuator takes the form of an electromagnet. Solenoid valves are control units which, when electrically energized or de-energized, either shut off or allow fluid flow. The variety of different designs which are available enables a valve to be selected to specifically suit the application in question. ![]() They are being used to an increasing degree in the most varied types of plants and equipment. Solenoid valves are used wherever fluid flow has to be controlled automatically.
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