Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2007-06-19
2007-06-19
Rivell, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C137S625240, C251S283000, C091S37500R
Reexamination Certificate
active
11532122
ABSTRACT:
A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pressure zone of the valve. Both orifices close together from a centered condition of the valve and fully close substantially together at a fully closed condition of the valve. The downstream orifice is larger than the upstream orifice when open to minimize the likelihood of cavitation and noise. An equalization passage fluidly connects both intermediate pressure zones to equalize pressure despite variations in orifice size due to manufacturing tolerances. The control valve includes a bypass passage in parallel with the flow circuits. A pressure relief valve in the control valve has a normally closed valving member in the bypass passage that opens the valve in the event of overpressure.
REFERENCES:
patent: 2406173 (1946-08-01), Stephens
patent: 2907349 (1959-10-01), White
patent: 3022772 (1962-02-01), Zeigler et al.
patent: 3896702 (1975-07-01), Shah et al.
patent: 4335749 (1982-06-01), Walter
patent: 4365683 (1982-12-01), Adams
patent: 4460016 (1984-07-01), Haga et al.
patent: 4461321 (1984-07-01), Bacardit
patent: 4471808 (1984-09-01), Thomsen et al.
patent: 4471809 (1984-09-01), Thomsen et al.
patent: 4558720 (1985-12-01), Larson et al.
patent: 4565115 (1986-01-01), Bacardit
patent: 4577660 (1986-03-01), Haga et al.
patent: 4624283 (1986-11-01), Futaba
patent: 4678052 (1987-07-01), Suzuki et al.
patent: 4733690 (1988-03-01), Brunner
patent: 4771841 (1988-09-01), Uchida et al.
patent: 4836249 (1989-06-01), LaPointe
patent: 4848402 (1989-07-01), Elser et al.
patent: 4852462 (1989-08-01), Uchida et al.
patent: 4860635 (1989-08-01), Uchida et al.
patent: 4884648 (1989-12-01), Uchida et al.
patent: 4924910 (1990-05-01), Tabata et al.
patent: 4942803 (1990-07-01), Rabe et al.
patent: 5207244 (1993-05-01), Behrens et al.
patent: 5230273 (1993-07-01), Fraley, Jr.
patent: 5255715 (1993-10-01), Phillips
patent: 5259413 (1993-11-01), Harpole et al.
patent: 5263512 (1993-11-01), Emori et al.
patent: 5417244 (1995-05-01), Behrens et al.
patent: 5447209 (1995-09-01), Sasaki et al.
patent: 5458153 (1995-10-01), Roeske
patent: 5542338 (1996-08-01), Rupp
patent: 5562124 (1996-10-01), Behrens et al.
patent: 5582207 (1996-12-01), Gilbert et al.
patent: 5638912 (1997-06-01), Haga et al.
patent: 5645107 (1997-07-01), Kobayashi et al.
patent: 5690143 (1997-11-01), Birsching
patent: 5794507 (1998-08-01), Strong
patent: 5845737 (1998-12-01), Suzuki et al.
patent: 5870941 (1999-02-01), Spillner et al.
patent: 5878780 (1999-03-01), Thomas
patent: 5881771 (1999-03-01), Thomas
patent: 5934405 (1999-08-01), Place
patent: 5937728 (1999-08-01), Strong
patent: 5975137 (1999-11-01), Strong
patent: 5996626 (1999-12-01), Thomas
patent: 6082403 (2000-07-01), Strong
patent: 6089270 (2000-07-01), Roeske
patent: 6240961 (2001-06-01), Strong
patent: 6349788 (2002-02-01), Wang et al.
patent: 6481461 (2002-11-01), Habermann et al.
patent: 7025091 (2006-04-01), Wang
patent: 7152627 (2006-12-01), Danley et al.
patent: 2005/0109408 (2005-05-01), Wang
patent: 2005/0284687 (2005-12-01), Sano
patent: 2006/0169520 (2006-08-01), Miyazaki
Danley David M.
Giurlando Kenneth C.
Tipton Jeffrey E.
Hooker & Habib, P.C.
R.H Sheppard Co., Inc.
Rivell John
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