Wells – Valves – closures or changeable restrictors
Patent
1975-08-25
1976-11-23
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
166315, 166324, 137461, E21B 4312
Patent
active
039931366
ABSTRACT:
Disclosed is a method of utilizing an apparatus for effecting operation of valve closure element in a subsurface safety valve. Preferably, a ball-type closure element is at least partially spaced from sealing engagement with a valve seat for equalizing well pressure about the ball closure element and minimizing frictional resistance of the ball element to operating rotation prior to effecting rotation of the ball element about a pair of substantial fixed ball element support members concentrically engaging the ball element on opposite sides thereof. Rotating cams move a lower seat from the ball element in response to initial reciprocating movement of the valve operator prior to effecting partial spacing and rotating open the ball element.
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patent: 3667557 (1972-06-01), Todd et al.
patent: 3703193 (1972-11-01), Raulins
patent: 3744564 (1973-07-01), Mott
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patent: 3830297 (1974-08-01), Cockrell
patent: 3868995 (1975-03-01), Crowe
patent: 3901315 (1975-08-01), Parker et al.
patent: 3901321 (1975-08-01), Mott
Hydril Company
Novosad Stephen J.
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