Fluid handling – Self-proportioning or correlating systems – Self-proportioning flow systems
Patent
1994-03-15
1995-01-03
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-proportioning flow systems
137118, G05D 1103
Patent
active
053777174
ABSTRACT:
A hydraulic flow control valve assembly comprises an inlet port for input fluid flow from a pump, a first outlet port for output fluid flow to a power steering unit, a second-outlet port for output fluid flow to an accumulator of a braking system, and an excess flow port for output fluid flow to other services or a tank. A flow control valve controls the fluid flow from the inlet port to the outlet ports and the excess flow port, and a load sensing port communicates a load-dependent pressure signal from the power steering unit to the valve so as to provide priority fluid flow to the power steering unit. A pilot valve is provided for cutting off the load-dependent pressure signal when the pressure within the accumulator falls below a predetermined value so as to provide for fluid flow from the valve to the accumulator, and in addition a pressure difference sensing arrangement communicates the pressure difference across a restrictor to the valve so as to provide fluid flow to the accumulator. This assembly permits priority flow from the pump to a power steering unit, as well as providing for fluid flow to the accumulator, as necessary, and providing excess flow as available to a third device.
REFERENCES:
patent: 3334705 (1967-08-01), Lam
patent: 3642019 (1972-02-01), Kramer
patent: 3939859 (1976-02-01), Ueda et al.
patent: 4332270 (1982-06-01), Budecker
Barnes Michael S.
Toogood Graham J.
Hepperle Stephen M.
Ultra Hydraulics Limited
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