Automatic valve actuator

Fluid handling – Destructible or deformable element controlled – Heat destructible or fusible

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Details

137 77, 137 785, F16K 1740

Patent

active

042757541

ABSTRACT:
A valve actuator provides preselected automatic spring-powered actuation of a rotary-actuated valve in response to fire, or other occurrence of a specific exigent type. The actuator is secured to a valve having a shaft extending from the valve body and rotatable through a predetermined rotational extent, e.g. 90.degree., for moving a valve element between open and shut portions. The actuator comprises a coiled or spiral torsion spring in an enclosure protectively covering the spring. One end of the spring is secured relative to the cover. A coupling is operatively connected to the other end of the spring and biased by spring force for being drivingly rotated for valve actuation. A camming arrangement holds the coupling against rotation by camming force against the spring force, a releasable link being operatively interconnected with the camming arrangement for maintaining the camming force. The link releases in response to the fire or other exigent occurrence exterior to the cover for releasably permitting rotation of the coupling. The actuator includes structure for securing the actuator to the valve body, with the coupling providing lost arcuate motion coupling to the shaft for causing rotation of the shaft through a desired angular extent for closing the valve, opening it, or causing it to fail in an "as was" position as desired. The lost arcuate motion coupling permits normal rotation of the shaft without the shaft being subjected to said spring force.

REFERENCES:
patent: 725827 (1903-04-01), Cowles
patent: 981844 (1911-01-01), Dearing
patent: 998507 (1911-07-01), Hasty
patent: 1039693 (1912-10-01), Burlingame et al.
patent: 1546637 (1925-07-01), Ernst
patent: 1633813 (1927-06-01), Hawley
patent: 1831021 (1931-11-01), Markel
patent: 1840959 (1932-01-01), Kraft
patent: 3538929 (1970-11-01), Botkin
patent: 3874859 (1975-04-01), Krause

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