System for making up or breaking out threaded joints of pipe

Details System for making up or breaking out threaded joints of pipe System for making up or breaking out threaded joints of pipe

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 29/00 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2084852

There is disclosed a system for use in making up or breaking out threaded joints of pipe which includes a power tong having a head rotatably mounted on a housing and jaws on the head movable into and out of positions gripping the joint for rotation with the head in response to the supply thereto and exhaust therefrom of fluid under pressure. A conduit connecting the fluid reservoir with pistons on the jaws includes a coupling having readily connectible and disconnectible parts, with a check valve and a vent valve installed in one end of the conduit between the check valve and the jaws, so that fluid pressure may be maintained on the pistons when the vent valve is closed and exhausted from the pistons upon opening of the vent valve.

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