Demand responsive flow control valve

Details Demand responsive flow control valve Demand responsive flow control valve

1984-04-09

1986-02-18

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

G05D 701

Patent

active

045706620

ABSTRACT:
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 from 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 fluid 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.

REFERENCES:
patent: 2900960 (1959-08-01), Gratzmuller
patent: 2981067 (1961-04-01), Clark et al.
patent: 3367354 (1968-02-01), Gallant
patent: 3505899 (1970-04-01), Dye
patent: 4505293 (1985-03-01), Strange

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