Back-pressure valve and actuation system

Details Back-pressure valve and actuation system Back-pressure valve and actuation system

2005-03-02

2008-12-02

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

C091S463000

Reexamination Certificate

active

07458212

ABSTRACT:
A back-pressure valve comprises a case having first and second oil chambers through which oil passes. A piston is slidably accommodated within the case to partition the first oil chamber and the second oil chamber. A spring urges the piston in a sliding direction. A projecting member and a check valve allow the first oil chamber to communicate with the second oil chamber when the pressure of the oil in the first fluid chamber reaches a predetermined pressure. An area of the piston on which oil pressure is received in the first oil chamber is made lager than an area on which oil pressure is received in the second oil chamber. A part of the piston located at an end thereof opposite to the end thereof which faces the first oil chamber communicates with the outside of the case.

REFERENCES:
patent: 5343703 (1994-09-01), Kamimura
patent: 5597012 (1997-01-01), Moinard
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patent: 08-226404 (1996-09-01), None
patent: 09-144713 (1997-06-01), None
patent: 09-328098 (1997-12-01), None
patent: WO 87/06319 (1987-10-01), None

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