Backflow check valve

Details Backflow check valve Backflow check valve

1976-08-19

1977-12-20

Cline, William R.

Fluid handling

Removable valve head and seat unit

1375278, F16K 1503

Patent

active

040635708

ABSTRACT:
A flap valve, designed to be installed and maintained in the standard cleanout wye of a conventional plastic plumbing system through the side channel thereof without removing said wye from service, comprising a flap with a flexible sealing gasket and a rigid backing plate, a valve seat with an O-ring seal and a locking tooth, which seat seals to the upstream channel of said wye when pressed into said channel, a hinge formed by attaching an extension of said sealing gasket to a curved downstream edge of said valve seat with a hinge clamp so that the extension of the sealing gasket will bend around said curved downstream edge, and a stop to prevent said flap from opening too widely, said stop being an extension of said hinge clamp.

REFERENCES:
patent: 200093 (1878-02-01), Sargent
patent: 2664264 (1953-12-01), Fennema
patent: 3128785 (1964-04-01), Krummel
patent: 3152608 (1964-10-01), Morrison et al.
patent: 3814124 (1974-06-01), Bell
patent: 4009366 (1977-02-01), Danell

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