Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1986-07-25
1987-03-17
Look, Edward K.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60413, 92151, F16D 3102
Patent
active
046497048
ABSTRACT:
The present invention is directed to a pressurized fluid accumulator adapted to be connected to a subsea valve actuator on a drilling wellhead assembly, prior to lowering the combined assembly to the ocean floor.
The apparatus of the present invention consists of a pressure compensated piston located in a first hydraulic cylinder. Movement of this piston causes pressurized hydraulic fluid to be delivered in sufficient volume to activate a subsea hydraulically-activated valve.
The first piston is connected to and driven by a second piston contained in a second hydraulic cylinder. Charging and accumulation of pressurized hydraulic fluid in the first cylinder causes a nearly absolute vacuum to be developed under the second piston. The pressure differential between this vacuum and the prevailing sea pressure is used to move the first piston during delivery of the hydraulic fluid to the actuator of the hydraulically activated valve.
REFERENCES:
patent: 2393524 (1946-01-01), Fant
patent: 3856048 (1974-12-01), Gratzmuller
patent: 3918498 (1975-11-01), Schneider
patent: 3987708 (1976-10-01), Uhrich
patent: 4204461 (1980-05-01), Gratzmuller
patent: 4205594 (1980-06-01), Burke
patent: 4475710 (1984-10-01), Leupers
Look Edward K.
Shell Offshore Inc.
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