Patent ID: 6786202
Filing Date: 2004-09-07
Classification: F04B

Abstract:
A hydraulic pump, comprising:a housing having a fluid inlet and a fluid outlet; a pumping element operable to increase the pressure of fluid received through the fluid inlet and to generate a flow of pressurized fluid through the fluid outlet; a control device operatively engaged with the pumping element to control the flow rate of the flow of pressurized fluid generated by the pumping element; a low pressure reservoir; a drain passageway fluidly connecting the control device with the low pressure reservoir; a control valve disposed in the drain passageway between the control device and the low pressure reservoir, the control valve being configured to selectively allow fluid to flow from the control device to the low pressure reservoir to reduce a pressure within the control device; a fluid passageway connecting the control valve with the fluid outlet; and a valve disposed in the fluid passageway between the fluid outlet and the control valve, the valve moveable between a first position where the valve blocks a flow of fluid relative to the fluid passageway and a second position where a flow of fluid is allowed to flow through the fluid passageway.