Method and apparatus for selectively varying the flow rate of se

Details Method and apparatus for selectively varying the flow rate of se Method and apparatus for selectively varying the flow rate of se

1993-09-24

1994-11-22

Bertsch, Richard A.

Pumps

One fluid pumped by contact or entrainment with another

Contact or entrainment within rotary impeller

417 53, 417244, F04C 1900, F04B 300

Patent

active

053663489

ABSTRACT:
A two stage liquid ring vacuum pump having a selectively variable flow rate of service liquid through a first stage and a second stage. The flow rate through the second stage is reduced by venting service liquid from the second stage prior to normal passage through a discharge port. The vented service liquid is introduced in the first stage to enhance the pumping capacity of the first stage.

REFERENCES:
patent: Re29747 (1978-08-01), Roe et al.
patent: 1904321 (1933-04-01), Nash
patent: 2672276 (1954-03-01), Adams
patent: 3108738 (1963-10-01), Luhmann
patent: 4685865 (1987-08-01), Auschrat
patent: 5246348 (1993-09-01), Wallace et al.

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