Importance

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Abstract

An electrically-operated three-way plunger-type solenoid valve assembly includes a housing, a valve seat insert provided in the housing, an electromagnetic actuator, and an exhaust port body, which extends into a sleeve passage of the electromagnetic actuator. A non-magnetic member is positioned in the sleeve passage of the electromagnetic actuator and includes an orifice in communication with an exhaust passage of the exhaust port body. A plunger is positioned in the non-magnetic member and supported for reciprocal axial movement in the non-magnetic member. A biasing member is provided which applies a spring force to the plunger, with the electromagnetic actuator generating a magnetic field having sufficient magnitude to move the plunger against the force of the biasing member. In this manner, the electromagnetic actuator selectively moves the plunger to control the communication between inlet and outlet openings of the valve to open and closed the valve. The non-magnetic member provides a magnetic gap between the plunger and the electromagnetic actuator and the exhaust port body to magnetically isolate the plunger from any residual magnetic field remaining in the electromagnetic actuator and the exhaust port body after the electromagnetic actuator is de-energized thereby reducing the required force of the biasing member and, further, forming a quick response valve.

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First Claim