| 摘要 |
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 O-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. <IMAGE> |
