Valves and valve actuation – Fluid actuated or retarded – With mechanical movement between actuator and valve
Reexamination Certificate
2005-01-11
2005-01-11
Keasel, Eric (Department: 3754)
Valves and valve actuation
Fluid actuated or retarded
With mechanical movement between actuator and valve
C251S250000
Reexamination Certificate
active
06840493
ABSTRACT:
A valve actuator is provided in which a complementary set of pinions, each driven by a pair of racks, are located on opposite sides of the valve to be actuated. The racks are part of an annular bearing assembly and are coupled to one another through a hydraulic cylinder or some other displacement device. A pinion retaining sleeve is provided to shield the racks and pinions and prevents parts of the valve actuator from being thrown in operation. The piston retaining sleeve may include a maintenance aperture for installing or repairing a pinion and a second aperture for viewing the rotation of the pinion. The bearing assemblies each include a bearing housing and a bearing retainer that cooperate to shield the bearing assembly.
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Varco Drilling Systems, IBOP Valves & IBOP Actuator Assembly.
Replacement Kellyguard.
International Search Report for International Application No. PCT/US03/09859.
Kuttel Beat
Richardson Allan S.
York Lemuel T.
Baker & Botts L.L.P.
Keasel Eric
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