DEMAND RESPONSIVE FLOW CONTROL VALVE

摘要

DEMAND RESPONSIVE FLOW CONTROL VALVE A demand responsive flow control valve mechanism has a valve member which receives fluid flow from a power steering pump and delivers a predetermined amount of fluid to an operating system such as the power steering gear. The excess fluid delivered by the pump is directed by the valve member to a bypass port from which the excess fluid is returned to the pump or a reservoir. The fluid flow to the operating system is controlled by differential areas disposed on a spool valve and a flow regulating orifice sensitive to system flow for determining the pressure differential to be applied to the differential areas. The operating system has a variable orifice which serves as a demand regulator for establishing the pressure level requirements for the pump. The valve spool responds to the pressure differential and system pressure level to bypass flailed as required. A pair of check valves are disposed in the spool valve and are operable to provide two stages of pressure relief for the operating system.