Vacuum processing system and method

Details Vacuum processing system and method Vacuum processing system and method

1990-11-19

1992-02-11

Nilson, Robert G.

Fluid handling

Processes

Carbonated beverage handling processes

137494, 137907, 251 58, G05D 1606

Patent

active

050868012

ABSTRACT:
A vacuum processing system and method by which system turbulence is reduced utilizing a vacuum responsive flow controlling valve that is located between a vacuum pump and a vacuum processing chamber to restrict the rate of pumpdown. A valve member of the flow controlling valve, such as a butterfly valve closure plate, is positionally shifted by a pressure differential responsive actuator as a function of the extent to which the pressure in the vacuum processing chamber has been reduced by the pump. During the initial phase of pumpdown, the valve closure member is in its maximally closed position, with evacuation of the vacuum processing chamber occurring solely through a leakage path past the valve member. After a predetermined pressure is reached, the valve member slowly opens as the pressure differential in the actuator increases, until a maximally open position is achieved.

REFERENCES:
patent: 2445163 (1948-07-01), Williamson
patent: 2744719 (1956-05-01), McRae
patent: 2950730 (1960-08-01), Svensson
patent: 3929314 (1975-12-01), Stratynski
patent: 4073465 (1978-02-01), Sheppard
patent: 4194526 (1980-03-01), Stromberg
patent: 4299373 (1981-11-01), Troyer
patent: 4316597 (1982-02-01), Goodman et al.

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