Vacuum valve apparatus

Details Vacuum valve apparatus Vacuum valve apparatus

1976-12-20

1978-07-11

Rosenthal, Arnold

Valves and valve actuation

With correlated flow path

With mounting or support

318474, 318469, E16K 3104

Patent

active

040997049

ABSTRACT:
Disclosed is a vacuum valve apparatus comprising a valve head, a motor for driving the valve head, means for checking the position of the valve adapted to issue a first signal upon detecting that the valve head is moved to be within a predetermined valve-closed range, means for checking electric current adapted to issue a second signal when the driving current for the motor is increased to a predetermined value, switching means adapted to cut the driving current supply to the motor upon detecting said second signal, and means for issueing a third signal for confirming the complete closure of the valve when both of the first and the second signals are simultaneously obtained.

REFERENCES:
patent: 916831 (1909-03-01), Bettinger
patent: 2600549 (1952-06-01), Ledbetter
patent: 3341760 (1967-09-01), Fry
patent: 4001661 (1977-01-01), Terabayashi

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