Stop changer tool for in-service valve

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

1984-09-24

1986-07-01

Jones, Jr., James L.

Metal working

Means to assemble or disassemble

Valve applying or removing

138 89, 138 97, B23P 1904

Patent

active

045971471

ABSTRACT:
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 predetermined 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.

REFERENCES:
patent: 2299365 (1942-10-01), Valuch
patent: 2462748 (1949-02-01), Johnson
patent: 2867243 (1959-01-01), Bowan
patent: 3044496 (1962-07-01), Maisch
patent: 4418592 (1983-12-01), Altman
Muller Company brochure: "Plugging Unit Parts and Dimensions", regarding stop changer plugging units H-17010 to 17014.

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