Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1990-10-22
1991-11-19
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
137599, F16K 1718
Patent
active
050657844
ABSTRACT:
An hydraulic valve assembly controls the supply of hydraulic fluid to an hydraulic strut of a vehicle suspension and is formed in a valve block having an hydraulic delivery line between a pump delivery port and the strut via a check valve which allows flow in one direction only from the pump to the strut. Three parallel hydraulic lines connect the delivery line to a fluid return line. One line has a relief valve that only opens if there is excess pressure in the delivery line. Another line has a series connection of a solenoid-operated pressurizing valve and a pressure-sensing valve. Both valves are normally open, the solenoid-operated valve being closed when the suspension becomes too low, and the pressure-sensing valve closing when pressure at the strut port falls. The other hydraulic line includes a normally-closed solenoid-operated depressurizing valve and a normally-open relief valve. The depressurizing valve is opened when the suspension becomes too high, the relief valve closing when pressure falls to a minimum safe level for the strut.
REFERENCES:
patent: 2362713 (1944-11-01), Mott
patent: 2372393 (1945-03-01), Ray
patent: 2517406 (1950-08-01), Mott
patent: 4590958 (1986-08-01), Brunner
patent: 4633761 (1987-01-01), Schweikert
patent: 4635671 (1987-01-01), Viegas
patent: 4852905 (1989-08-01), Tanaka et al.
patent: 4867476 (1989-09-01), Yamanaka et al.
Chilvers David
Davies Anthony R.
Downward Steven J.
Hepperle Stephen M.
Smiths Industries Public Limited Company
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