Valve with noise reducing two stage pressure drop

Details Valve with noise reducing two stage pressure drop Valve with noise reducing two stage pressure drop

1994-02-07

1995-05-23

Nilson, Robert G.

Fluid handling

Systems

Multi-way valve unit

91375A, F15B 900

Patent

active

054172446

ABSTRACT:
A valve for controlling flow of hydraulic fluid. The valve includes first and second relatively movable valve members (60 and 62). The valve members (60 and 62) include cooperating surfaces (112, 142, 144) which define first and second orifices for metering fluid from a pressurized fluid source (44) toward first and second locations (22 and 24) in a fluid utilization device (12). The valve members (60 and 62) have a displaced position in which the first orifice is increased in size and the second orifice is decreased in size. The increased size of the first orifice reduces a pressure drop across the first orifice. The decreased size of the second orifices increases a pressure drop across the second orifice. The valve members (60 and 62) include means (114 and 146) for increasing a pressure on a downstream side of the second orifice to reduce the pressure drop for controlling valve noise.

REFERENCES:
patent: 4335749 (1982-06-01), Walter
patent: 4469342 (1984-09-01), Millard
patent: 4516471 (1985-05-01), Duffy
patent: 4799514 (1989-01-01), Tanaka et al.
patent: 4848402 (1989-07-01), Elser
patent: 5097869 (1992-03-01), Emori
patent: 5207244 (1993-05-01), Behrens et al.
patent: 5259413 (1993-11-01), Harpole et al.
Technical sketch of a BMW/ZF-2 Step Valve dated Mar. 18, 1993.

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