Abstract: A drill stem safety valve actuator that eliminates the need for a hydraulic union. The actuator can include a mounting sleeve that can be affixed to the valve, that can further have a pinion gear that can rotate a ball valve. The actuator can include a rack sleeve slidably disposed on the mounting sleeve, having a rack configured to engage the pinion wherein sliding the rack sleeve linearly along the length of the mounting sleeve rotates the pinion, thus, the ball valve.

Abstract: A drill stem safety valve actuator that eliminates the need for a hydraulic union is provided. The actuator can include a mounting sleeve that can be affixed to the valve, that can further have a pinion gear that can rotate a ball valve. The actuator can include a rack sleeve slidably disposed on the mounting sleeve, having a rack configured to engage the pinion wherein sliding the rack sleeve linearly along the length of the mounting sleeve rotates the pinion, thus, the ball valve.

Abstract: A vacuum plasma spray system includes a spray chamber, a motor-driven manipulator including a drive mechanism and a respective control system, and a plasma gun mounted on the manipulator in the spray chamber. The drive mechanism comprises three drive groups of which a first drive group facilitates upward and downward motion of the gun for adjusting spray distance and second and third drive groups facilitate swiveling motions of the gun around horizontal axes. The manipulator has a hermetically sealed outer housing and a hermetically sealed inner housing contained in the outer housing. The inner housing contains the second and third drive groups, protrudes into the chamber and carries the gun. The first drive group is arranged at least partially in the outer housing to effect lifting or lowering of the inner housing thereby adjusting spray distance.