Apparatus for stabbing and threading a safety valve into a well pipe

摘要

In accordance with an illustrative embodiment of the present invention, an apparatus for stabbing and threading a safety valve into a well pipe to prevent upward flow comprises a tubular canister rotably mounted on a carriage assembly that is slidably mounted on an upstanding frame. The lower end of the frame has a swivel mounting to a bracket that is attached to the side of an elevator-type clamp means by which the apparatus is clamped onto the upper end portion of the pipe. With the canister pivoted into position over the pipe, a gear drive is operated by a hand wheel to cause the canister to be rotated and simultaneously lowered toward the pipe whereby a safety valve mounted inside the canister is automatically threaded into the upper end of the pipe and can be closed to shut off upward flow.