Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1990-09-25
1992-05-12
Bertsch, Richard A.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417307, 417309, F04B 4900
Patent
active
051121999
ABSTRACT:
A fluid pump unit has a flow control valve which returns a portion of a working fluid discharged from a pump assembly when rotation speed of a rotor increases to become greater than a predetermined value. The flow control valve includes an essentially cylindrical spool chamber defined in a pump case, and a valve spool movably housed within the spool chamber. The spool chamber has a pair of through openings on the side wall thereof which through openings are selectively open and closed by movement of the spool valve. The pump case is formed with a pair of drain passages which are respectively communicated with the through openings of the spool chamber independently of each other. When rotation speed of a rotor of the pump assembly becomes greater than a predetermined value, the spool valve opens the through openings to return a part of the discharged working fluid to an inlet passage through which working fluid is introduced from a fluid source into the pump assembly.
REFERENCES:
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patent: 4473341 (1984-09-01), Ohe et al.
patent: 4498853 (1985-02-01), Sakamaki et al.
patent: 4557670 (1985-12-01), Inagaki et al.
patent: 4564338 (1986-01-01), Ilg
patent: 4637782 (1987-01-01), Teubler et al.
patent: 4842490 (1989-06-01), Watanabe et al.
patent: 4890987 (1990-01-01), Sato et al.
Hamao Miyoko
Otaki Mizuo
Atsugi Unisia Corporation
Basichas Alfred
Bertsch Richard A.
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