Vacuum pump switch

Details Vacuum pump switch Vacuum pump switch

1980-03-06

1982-01-05

Freeh, William L.

Pumps

With signal, indicator, or inspection means

200 83A, 200 83C, 200 83S, 417223, F04B 4900

Patent

active

043091490

ABSTRACT:
A sensor responsive to a differential pressure between a fluid in a reservoir and the surrounding environment for operating a switch to activate and deactivate a pump and maintain the pressure of the fluid in the reservoir within a predetermined range.

REFERENCES:
patent: 3253772 (1966-05-01), Parker
patent: 3950946 (1976-04-01), Sakai et al.
patent: 4190752 (1980-02-01), Rogers
patent: 4212591 (1980-07-01), Lamontagne et al.

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