Combined pressure ratio and pressure differential relief valve

Details Combined pressure ratio and pressure differential relief valve Combined pressure ratio and pressure differential relief valve

1998-03-05

2000-08-01

Walberg, Teresa

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

417308, 417307, 418 551, F04B 4900

Patent

active

060957654

ABSTRACT:
A pressure relief device has a chamber formed in a fixed scroll of a scroll-type machine, such as a scroll compressor. A piston is housed within the chamber releasably sealingly engaging a first passage which exposes the chamber to a discharge port formed in the fixed scroll. A second passage exposes the chamber to a suction plenum. A third passage exposes the chamber to pockets formed by the fixed and orbiting scrolls of the scroll compressor. In certain preferred embodiments, a pressure relief valve having a stem and a head is housed within a cavity formed in the piston. The head is biased by a spring into releasable sealing engagement with an aperture formed in the piston. The pressure relief valve passes fluid to the suction plenum whenever the difference between a discharge pressure and a suction pressure exceeds a predetermined value. The piston passes fluid to the suction plenum whenever the ratio of discharge pressure to suction pressure exceeds a predetermined value.

REFERENCES:
patent: Re35216 (1996-04-01), Anderson et al.
patent: 4497615 (1985-02-01), Griffith
patent: 4560330 (1985-12-01), Murayama et al.
patent: 4840845 (1989-06-01), Moilanen
patent: 4904164 (1990-02-01), Mabe et al.
patent: 5169294 (1992-12-01), Barito
patent: 5362210 (1994-11-01), Richardson
patent: 5527158 (1996-06-01), Ramsey et al.
patent: 5713726 (1998-02-01), Nakayoshi
patent: 5803716 (1998-09-01), Wallis et al.
patent: 5860791 (1999-01-01), Kikuchi

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