Sump pump with air column therein when pump is not operating

Details Sump pump with air column therein when pump is not operating Sump pump with air column therein when pump is not operating

1978-12-13

1980-08-05

Freeh, William L.

Pumps

Processes

417 40, 4172115, 417 2, F04B 4906, F04B 4900

Patent

active

042159750

ABSTRACT:
An air column is employed in a sump pump to exclude liquid and foreign matter therein from the pump interior until a time just prior to priming and pumping. Just prior to the pump being turned on the air column is vented, thus permitting the liquid to rise to a level in the pump commensurate with the level elsewhere in the sump and thereby priming the pump.

REFERENCES:
patent: 2810350 (1957-10-01), MacWilliams
patent: 3972647 (1976-08-01), Niedermeyer
patent: 4080104 (1978-03-01), Brown
patent: 4171186 (1979-10-01), Chapman

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