Backflow check valve

Details Backflow check valve Backflow check valve

F - Mech Eng,Light,Heat,Weapons

16

K

137/56

F16K 15/03 (2006.01)

Patent

CA 1081085

Docket No. 6666 Title Improved Backflow Check Valve Inventor H. Charles Mitchell & Donald G. Fettes Abstract of the Invention A flap valve, designed to be installed and main- tained 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.

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