| 摘要 |
A hydraulically operated actuator has a hydraulically driven piston 30 slidable in a chamber 31, the movement of the piston 30 being converted into rotary movement of a shaft 40 by an assembly 33, 43, 44, 50, 51 which limits the torque placed on the shaft by the piston in its drive stroke. The torque is limited since a non-rotatable axially movable member 43 with pins 51 riding in helical slots 50 in the rotary shaft is displaced by the piston 30 through the intermediary of a spring 44. A return spring 52 enables the piston 30 and drive spring 44 to return to their initial positions upon release of the hydraulic supply pressure applied to the piston through a port 85. A static seal 30a on the piston seals against an end wall 31a at the completion of the drive stroke of the piston. The actuator may be used to operate a subsea diverter to direct "pump down" or through flow line (TFL tools) through wye- branched flow passageways formed in a diverter body member located on a submerged well head. <IMAGE> |
