Two-way valves are shut-off valves with one inlet port and one outlet port (Fig. 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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