Stop changer tool for in-service valve

Details Stop changer tool for in-service valve Stop changer tool for in-service valve

B - Operations, Transporting

23

P

26/162

B23P 19/04 (2006.01) F16K 7/20 (2006.01) F16K 43/00 (2006.01) F16L 55/132 (2006.01)

Patent

CA 1264532

STOP CHANGER TOOL FOR IN-SERVICE VALVE Abstract of the Disclosure A stop changer tool for removal of an in-service valve under pressure and comprised of a displaceable shaft assembly supporting at one end an axially compressible elastomeric plug adapted to be inserted through the valve into the upstream pipe. The plug is mounted between a pair of restraining ends such that displacing the shaft assembly in a withdrawal direction draws the restraining ends toward each other to compress and diametrically enlarge the plug until a pressure sealing engagement is achieved with the pipe surface thereat. The restraining ends are formed of laterally displaceable contiguous elements having pre- determined face angles on opposing surfaces whereby they are relatively displaced laterally outward concomitantly with compression of the plug so as to substantially restrain the plug against axial extrusion.

490966

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