Importance

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Abstract

A solenoid-actuated valve assembly includes a valve body defining a supply port in communication with a fluid supply, an upper or first chamber, a lower or second chamber in communication with the first chamber, a first valve seat, and a control port in fluid communication with a downstream hydraulic component. An armature seals against the first valve seat when a solenoid is in a closed position, and a spring otherwise biases the armature against the upper valve seat. A lower valve device is positioned in the second chamber, and has a moveable portion that selectively admits fluid into the second chamber in the open position. The valve body defines at least one orifice between the supply port and the first valve seat, the orifice providing a pressure unloading function for venting fluid that leaks past the valve device when the solenoid is not being actuated.

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First Claim