Apparatus for introducing sealant into a clearance between an ex

Pipes and tubular conduits – Repairing – Patches

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138 98, 264269, 405154, F16L 5518

Patent

active

054978076

ABSTRACT:
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.

REFERENCES:
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patent: 3772113 (1973-11-01), Patrick
patent: 4579148 (1986-04-01), Sovish et al.
patent: 4646787 (1987-03-01), Rush et al.
patent: 4728223 (1988-03-01), Rice
patent: 5282494 (1994-02-01), Elgar et al.
patent: 5287893 (1994-02-01), Elgar et al.
patent: 5309947 (1994-03-01), Hinger
patent: 5372162 (1994-12-01), Frey
patent: 5379803 (1995-01-01), Elgar et al.

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