Fail-safe actuator and hydraulic system incorporating the same

Details Fail-safe actuator and hydraulic system incorporating the same Fail-safe actuator and hydraulic system incorporating the same

1981-07-07

1983-11-01

Chambers, A. Michael

Valves and valve actuation

Fluid actuated or retarded

Fluid and non-fluid actuators

60403, 60418, 91459, 92137, 251 27, F16K 3100

Patent

active

044126700

ABSTRACT:
The present invention is directed to an improved fail-safe actuator and hydraulic system incorporating the same. The actuator includes energy storage means in the form of a spring adapted to set a control device in a predetermined condition, illustratively in the closed condition, responsive to a failure situation, illustratively, a power failure. The actuator includes a coupling which permits normal operation of the control device without cycling the spring energy storage means, thus increasing the life of the spring and eliminating energy wastage inherent in cocking the spring during each operative cycle.

REFERENCES:
patent: 2618243 (1952-11-01), Tregonowan
patent: 3144812 (1964-08-01), Rager et al.
patent: 3542331 (1970-11-01), Conalizo
patent: 3801062 (1974-04-01), Arn et al.
patent: 3839945 (1974-10-01), Jacobellis
patent: 3863446 (1975-02-01), Giwosky
patent: 4003547 (1977-01-01), Snyder et al.
patent: 4085587 (1978-04-01), Garlinghouse

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