Torque tripping mechanism for a valve

摘要

TORQUE TRIPPING MECHANISM FOR A VALVE Abstract of the Disclosure: A torque limiter for use in an actuating drive stem of a subsea wellhead having a collar with an 5 axial bore and a slot through its side. The slot includes a projection directed towards a lower end of the collar and has an edge oriented oblique to the collar axis. A driven shaft inserts in the bore, and a pin mounted in the driven shaft engages the slot. A spring assembly coupled to the driven shaft pushes the collar to retain the pin in the end of the projection. A driveshaft with a drive pin inserts into the bore on an upper side of the collar. The upper end of the collar includes a shoulder to that contacts the drive pin when the collar rotates. The spring compresses when excessive torque is in the driven shaft moving the pin up the projection and disengaging the drive pin and shoulder. Fig. 1 1 24- 16 1 Ax 56-,,7 78 -58 ~ I - 54 -61 Fig. 2A 62 63 Fx Fy 64-T - - 36