Vacuum pump assembly with built-in shutoff valve

Details Vacuum pump assembly with built-in shutoff valve Vacuum pump assembly with built-in shutoff valve

1978-03-06

1980-03-18

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417 24, F04B 4906

Patent

active

041937422

ABSTRACT:
A vacuum pump assembly is provided which includes a built-in pneumatic valve for closing the suction port of a vacuum pump of the assembly with an auxiliary valve being provided for controlling operation of the pneumatic valve. An electromagnetic valve is utilized as the auxiliary valve and a generator coupled with the shaft of the vacuum pump generates electric current in accordance with the operating stages of the pump in order to control the auxiliary valve.

REFERENCES:
patent: 1055139 (1913-03-01), Conrades
patent: 1104019 (1914-07-01), Thomas
patent: 1701359 (1929-02-01), Case
patent: 1786128 (1930-12-01), Sanford
patent: 1948907 (1934-02-01), Egli
patent: 1988296 (1935-01-01), Blume et al.
patent: 2566623 (1951-06-01), Lipman
patent: 3031128 (1962-04-01), Rubbra
patent: 3611715 (1971-10-01), Tatsutoni et al.

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