F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 55/11 (2006.01)
Patent
CA 2157449
An upstream plug for isolating a repair region of a pipeline includes a plurality of struts expandable radially outwardly into locking contact with the inside wall of the pipeline. The locking contact is enhanced by a wedging arrangement with operates virtually simultaneously with a mechanism driving the expandable struts to their expanded position. The overall arrangement includes a basic outer sleeve carrying the struts and the blocking seals. Insidethe outer sleeve, an inner sleeve is slidably mounted. It provides the expansionand wedging of the struts as it moves in a downstream direction relative to the outer sleeve driven by pressurized medium at the upstream end of the plug. A piston sleeve sliding inside the inner sleeve is exposed to pressurized medium at the downstream end of the plug. The pressure drives the piston in an upstream direction, causing the release of a locking pin mechanism connecting the inner and outer sleeves. Eventually, the piston sleeve engages an inner stopand then carries the inner sleeve in the upstream direction to actuate the expanding of the locking struts. The invention presents an improvement over previous design of a plug of this type in that there are no shear pins or the like and there is no need to reset the plug upon its release from the working position.
Gowling Lafleur Henderson Llp
Pa - Plug Inc.
LandOfFree
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