Safety valve in particular for closing an oil well

Details Safety valve in particular for closing an oil well Safety valve in particular for closing an oil well

1986-03-17

1987-03-24

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, 251 58, 251315, 251352, E21B 3410

Patent

active

046518282

ABSTRACT:
A ball element pivotally mounted on a sleeve that slides within the tubular valve member of a well safety valve has a radial slot extending across its width parallel to and offset from its pivotal axis. A bar extending in secant fashion across the valve member engages the slot, rotating the ball element to open and close the valve as the sleeve slides back and forth. An unslotted outer surface portion of the ball element mates with the valve seat during valve closing.

REFERENCES:
patent: Re25471 (1963-11-01), Fredd
patent: 2998077 (1961-08-01), Keithahn
patent: 3509913 (1970-05-01), Lewis
patent: 4009735 (1977-03-01), McGill et al.
patent: 4086935 (1978-05-01), Raulins et al.
patent: 4252197 (1981-02-01), Pringle
patent: 4446922 (1984-05-01), Bowyer et al.
patent: 4461353 (1984-07-01), Vinzant et al.
patent: 4467870 (1984-08-01), Langham
patent: 4522370 (1985-06-01), Noaek et al.
patent: 4569397 (1986-02-01), Brakhage, Jr. et al.

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