Importance

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Abstract

An improved flow-limiting fluid refill valve for use with a fluid-actuated pump having a fluid chamber comprises a valve housing, fluid inlet means in communication with a source of hydraulic fluid and fluid outlet means in fluid communication with the fluid chamber of the pump. A first valve within the valve housing is provided between the fluid inlet means and the fluid outlet means for permitting a flow of fluid from the fluid source to the fluid chamber when the suction pressure within the fluid chamber exceeds the first predetermined pressure limit indicating that the fluid within the fluid chamber has been depleted below a predetermined fluid limit. The improvement comprises a second valve within the valve housing for preventing the flow of fluid from the fluid source to the fluid chamber when the suction pressure within the fluid chamber exceeds a second predetermined pressure limit greater than the first predetermined pressure limit and indicating abnormal operation of the pump.

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First Claim