Monitor for double safety valves

Details Monitor for double safety valves Monitor for double safety valves

1979-02-23

1981-09-29

Maslousky, Paul E.

Expansible chamber devices

With separate biasing means for working member

Biasing means maintains working member intermediate stroke...

92 5R, 92138, 60535, F01B 3112, F01B 2526

Patent

active

042916135

ABSTRACT:
An improved electro-pneumatic monitor for double safety valves controlled by solenoid-operated pilot valves. The monitor comprises a relatively short spool centrally held by oppositely disposed captive springs. The sensing passages are provided with relatively small orifices which help to de-sensitize the monitor. The resulting construction is resistant to shifting in response to minor double valve irregularities which otherwise could create undesired lockout conditions.

REFERENCES:
patent: 2324750 (1943-07-01), Wiedmann
patent: 2491087 (1949-12-01), Cordwell et al.
patent: 2527727 (1950-10-01), Hobbs
patent: 2529393 (1950-11-01), Hogue
patent: 3606486 (1971-09-01), Doerfler
patent: 3606487 (1971-09-01), Kersting
patent: 3708211 (1973-01-01), Bueler
patent: 3799202 (1974-03-01), McAvoy

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