Fail-safe valve actuator

Details Fail-safe valve actuator Fail-safe valve actuator

1985-05-29

1987-02-17

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

251337, F16K 31122, F16K 3700

Patent

active

046433902

ABSTRACT:
A fail-safe valve actuator includes a hydraulic piston (17) and cylinder (15) for driving the valve stem (9) and gate member (35) of a gate valve into a first flow control state responsive to sufficient pressure delivered by a fluid or gas supply line (92). Upon failure or other loss of sufficient control line pressure, a volute spring (7) drives the cylinder (15), and hence the stem (9) and gate member (35), axially outward resulting in the valve being moved into a second flow control state.

REFERENCES:
patent: 2296145 (1942-09-01), Christensen
patent: 3378224 (1968-04-01), Boyle
patent: 3379405 (1968-04-01), Natho
patent: 3695577 (1972-10-01), Jespersen
patent: 3789875 (1974-02-01), McGee
patent: 4054156 (1977-10-01), Bensen
patent: 4423748 (1984-01-01), Ellett
patent: 4445424 (1984-05-01), Foster et al.
patent: 4526341 (1985-07-01), Thomas

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