Hydraulically operated actuator

Details Hydraulically operated actuator Hydraulically operated actuator

F - Mech Eng,Light,Heat,Weapons

16

J

277/30, 138/92.1

F16J 10/02 (2006.01) E21B 34/04 (2006.01) E21B 34/16 (2006.01) F16J 15/48 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1139189

APPLICATION FOR UNITED STATES PATENT HYDRAULICALLY OPERATED ACTUATOR ABSTRACT OF THE DISCLOSURE A hydraulically operated actuator employs multiple metal-to-metal static seals to isolate the hy- draulic fluid and to isolate the actuator from surrounding contaminating (ambient) fluids. A housing contains at least two linearly spaced apart chambers. A piston recip- rocates from a retracted position to an extended position (power stroke) and from the extended position to the re- tracted position (return stroke) in one of the chambers (hydraulic chamber). The hydraulic chamber is separated by the piston into two sections, one of which contains high pressure hydraulic fluid and the other of which con- tains low pressure hydraulic fluid. A first static metal seal ring unit is designed to seal first at the comple- tion of the power stroke of the piston to isolate the low pressure hydraulic fluid section from external con- taminating fluids which may be at a higher pressure. A second static metal seal ring unit is designed to seal at the completion of the return stroke of the piston also to isolate the low pressure section from external contami- nating fluids. Power for the return stroke is primarily supplied by springs, with biasing pressure from the ex- ternal environment providing a lesser contribution. A third static metal seal ring unit may be employed to ob- tain a simultaneous seal with the first metal seal ring unit to isolate the high pressure section from the low pressure section at the completion of the power stroke of the piston. Alternatively, an elastomer or a knife-edge - 1 - metal-to-metal type static seal may be substituted for the third metal seal ring unit. Deformable means positioned adjacent the first metal seal ring unit ensures that the third metal seal ring unit effects a seal once the first metal seal ring unit effects its seal. The actuator may be employed to operate a subsurface safety valve used to control flow of fluids through a well tubing and may be located external of the well tubing with the piston being linked to a valve operator. Means may be provided to compensate for any differences in travel between the pis- ton and valve operator. - 2 -

345581

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