Lift-turn valve and actuator assembly

Details Lift-turn valve and actuator assembly Lift-turn valve and actuator assembly

1990-06-04

1991-04-09

Walton, George L.

Valves and valve actuation

Mechanical movement actuator

Plural dissimilar mechanical movements

74 22R, 74 23, 74 57, 74 8914, 74107, 251163, 251188, 2512495, 251252, F16K 518, F16K 2500, F16K 31528

Patent

active

050058053

ABSTRACT:
A lift-turn valve actuator is provided for tapered plug valve and slip assemblies that accomplishes vertical movement of the plug and retraction of the slips from sealing engagement with the valve body prior to rotation of the plug member 90.degree. to its open position. The valve actuator assembly includes inner fitting inner and outer sleeve members each having cam slots formed therein with the cam follower of a valve actuating stem being engaged with both cam slots. Rotation of the outer sleeve member with respect to the static inner sleeve imparts initial vertical movement to the actuator stem, valve stem and valve plug for slip retraction as an initial component of movement followed by simultaneous rotational and upward movement of the plug member until the plug member has rotated 90.degree. to its open position. The cam slots further secure the follower of the actuator pin so that the plug member will not have the possibility of downward or counterrotational movement until the outer sleeve member is rotated in the opposite position for closure and sealing.

REFERENCES:
patent: 2791395 (1957-05-01), Prescott
patent: 3492880 (1970-02-01), Pearson
patent: 3793893 (1974-02-01), Heinen
patent: 4061115 (1977-12-01), Predhome, Jr.
patent: 4120479 (1978-10-01), Thompson, Jr.
patent: 4234157 (1980-11-01), Hodgeman et al.
patent: 4293117 (1981-10-01), Mueller
patent: 4350322 (1982-09-01), Mueller
patent: 4436280 (1984-03-01), Geisow
patent: 4666124 (1987-05-01), Giacobbi

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