Screw type vacuum pump

Details Screw type vacuum pump Screw type vacuum pump

1989-03-30

1991-05-28

Smith, Leonard E.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

4182012, F04B 4902, F04C 1816

Patent

active

050189476

ABSTRACT:
A screw type vacuum pump has in a passage leading to its suction port a check valve which is adapted to open the valve securely by hydraulic pressure to open the gas flow passage without the hunting phenomenon. This permits the selection of a spring with a suitable spring constant for seating the valve body on the valve seat securely and promptly to prevent reverse gas flows.

REFERENCES:
patent: 3687017 (1972-08-01), Lewis et al.
patent: 4498949 (1985-02-01), Schibbye et al.
patent: 4725210 (1988-02-01), Suzuki et al.

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