Apparatus and method for introducing sealant into a clearance

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 55/16 (2006.01) F16L 55/1645 (2006.01) F16L 55/18 (2006.01)

Patent

CA 2118678

Apparatus is provided for introducing sealant into a clearance between a replacement pipe 9 and an existing pipe 36 within which in use the replacement pipe 9 is located. The apparatus comprises a nose-cone 1 having a tubular body 6 for connection to the upstream end 8 of the replacement pipe 9, frangible means 20 in the form of a pop-out plug; pierceable metal foil; plastic film or membrane to seal the bore of the tubular body 6 and at least one non return valve 2 in the form of an elastic ring 2, rubber 0-ring 40 or plug 52 and spring assembly 53 to permit the flow of sealant from the bore of the body 6 into the clearance 37 by way of the wall of the body 6 but to resist return-flow from the clearance 37 into the bore.

ispositif servant à introduire le matériau d'étanchéité dans un espace entre un tuyau de remplacement (9) et un tuyau existant (36) à l'intérieur duquel le tuyau de remplacement utilisé est situé. Le dispositif comprend une pointe conique (1) munie d'un corps tubulaire (6) pour être raccordé à l'extrémité amont (8) du tuyau de remplacement (9), une partie frangible (20) sous la forme d'un bouchon éjectable; d'une feuille de métal perçable; d'un film ou d'une membrane de plastique servant à sceller l'alésage du corps tubulaire (6) et au moins un clapet anti-retour (2) sous la forme d'un anneau élastique (2), d'un joint torique en caoutchouc (40) ou d'un bouchon (52) et d'un ressort équipé (53) pour permettre l'écoulement du matériau d'étanchéité à partir de l'alésage du corps tubulaire (6) dans l'espace (37) par la paroi du corps tubulaire (6) mais destiné à résister à tout retour dans l'alésage en provenance de l'espace (37).

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