Patent ID: 7874307
Filing Date: 2011-01-25
Classification: F16K,Y10T

Abstract:
1. A method for installing a check valve in a pipe coupling: (a) providing a conventional plastic pipe coupling having an inner surface and an entirely uniform inner diameter except for a centrally disposed inner ridge, said inner ridge having an upstream edge and an opposite downstream edge; (b) providing a pipe which is shaped and dimensioned to be received by said pipe coupling; (c) providing a check valve including; (d) providing glue; (e) sliding said check valve into said entirely uniform inner diameter portion of said pipe coupling so that said check valve is completely inside said pipe coupling and said check valve abuts said inner surface and said inner ridge of said pipe coupling such that said circular seal abuts both said upstream edge of said inner ridge and said inner surface of said pipe coupling; and, (f) using said glue to glue said pipe in place in said pipe coupling so that said pipe abuts said check valve.