Controlled by-pass for a booster pump

Details Controlled by-pass for a booster pump Controlled by-pass for a booster pump

1988-05-24

1989-07-25

Smith, Leonard E.

Pumps

Processes

417 62, 417205, 417250, 417253, F04B 2312

Patent

active

048508063

ABSTRACT:
A method and apparatus for evacuating an enclosed chamber which utilizes a tandem connection of a booster pump and a mechanical pump in a manner to maximize the rate of evacuation of the chamber but without exceeding the rating of the booster pump and damaging it. A gas bypass around the booster pump is provided with a proportional valve that is operated to start an evacuation of the chamber with the bypass path fully opened but the gradually closing that path in a manner to maintain a differential pressure across the booster pump at a predetermined level, until the bypass path has been fully closed.

REFERENCES:
patent: 2492075 (1949-12-01), Van Atta
patent: 3446422 (1969-05-01), Bailleul-Langlais
patent: 4504194 (1985-03-01), Holden
patent: 4505647 (1985-03-01), Alloca
Roots Rotary Lobe Blowers RAS-RGS, Dresser Industries, Inc. Bulletin IRB-201-784, 1984.

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