Pump having an internal gas pump

Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...

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Details

417370, 417372, 417420, F04D 1314

Patent

active

053082290

ABSTRACT:
Pump apparatus having a wear end and a pump end is provided with means for preventing liquid being pumped from entering the wear end. An internal pump is positioned between the wear end and the pump end of sealless pumps to direct small quantities of gas from the wear end to the pump end at a pressure which prevents liquid in the pump end to pass into the wear end.

REFERENCES:
patent: 3513942 (1970-05-01), Sato
patent: 4812108 (1989-03-01), Kotera
patent: 4990055 (1991-02-01), Korenblit

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