Vacuum pumping system

Details Vacuum pumping system Vacuum pumping system

1980-04-07

1985-03-19

Gluck, Richard E.

Pumps

Successive stages

With interstage discharge or additional discharge from...

417309, F04B 4908

Patent

active

045056471

ABSTRACT:
In a two-stage vacuum pumping system having a single drive motor powering both stages, a by-pass line connected between the container being evacuated and the interstage line between the two stages for relieving excess pressure in the interstage line during the initial pressure pull-down of the container. This reduces the load on the second stage pump and thereby lowers the power requirements of the drive motor. A pressure switch actuated solenoid valve in the by-pass line, which is in the open position during the pull-down procedure, is closed when the container is evacuated to a set-point pressure. When the by-pass line is closed off the two stages work together to pump down the container to a desired pressure below the pressure switch set point.

REFERENCES:
patent: 2683418 (1954-07-01), Smith
patent: 3515164 (1970-06-01), Dunnous
Daugherty, et al., Fluid Mechanics with Engineering Applications, McGraw-Hill, New York, 1954, pp. 22-23.
Machine Design, Dec. 15, 1966, Pressure Switches, Herbert J. Zurstadt, pp. 30, 31, 34, 35.

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