Integral liquid pump and drainback valve

Details Integral liquid pump and drainback valve Integral liquid pump and drainback valve

1993-06-21

1995-03-14

Bertsch, Richard A.

Pumps

With condition responsive pumped fluid control

Normally open bypass or relief passage closed by increased...

417310, 137107, F04B 4900

Patent

active

053972198

ABSTRACT:
An integral liquid pump and drainback valve for use in pumping popcorn popping oil. A two-part housing is formed with one part having cavities forming inlet and outlet passages extending from an impeller cavity. A second part is formed with inlet and outlet ports and shuttle valve cavity connecting those ports. The inlet and outlet passages and the inlet and outlet ports respectively are in fluid communication with each other when the two parts are secured to each other. A resilient biasing means in the shuttle valve cavity moves the shuttle to a position wherein a fluid path is provided between the inlet and outlet ports when the pump impeller is not driven.

REFERENCES:
patent: 188905 (1877-03-01), Hildebrand
patent: 513635 (1894-01-01), Deverall
patent: 1045964 (1912-12-01), Friese
patent: 2733841 (1956-02-01), Waas
patent: 3097610 (1963-07-01), Swanson
patent: 3606905 (1971-09-01), Fehler
patent: 3628893 (1971-12-01), Carpigiani
patent: 3724723 (1973-04-01), Slavinski
patent: 3739953 (1973-06-01), Cretors
patent: 4838767 (1989-06-01), Ohe et al.
patent: 4902202 (1990-02-01), Bowden
patent: 5180291 (1993-01-01), Kent

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