Toilet flush valve assembly

Claim 1

A toilet flush valve assembly comprising: a. a body having a flushing passage therethrough and adapted to be carried by a toilet tank normally containing a head of water for flushing an associated toilet bowl; b. a valve seat at one end of said flushing passage; c. an upstanding overflow pipe carried by said body in laterally offset relation to said flushing passage, said overflow pipe communicating with said flushing passage through a lateral passage opening into said flushing passage at a point below said valve seat; d. a buoyant valve member comprising first and second generally dish-shaped body portions adapted to be connected together by interfitting engagement, one of said body portions having an annular rigid flange for seating on said valve seat to close said flushing passage under the hydrostatic pressure of such a head of water; e. a flexible sealing gasket carried by said valve member and positioned between said valve member flange and said valve seat in a manner defining a relatively small gap between said gasket and said flange when said valve member is lifted from said seat; f. guide rod means depending from said valve member; g. guide means positioned in said flushing passage below said valve seat for slidably receiving said rod means; and h. stop means comprising an arm member connected to said overflow pipe and positioned for abutting said valve member and limiting movement of said valve member away from said valve seat to open said flushing passage, the distance between the bottom of said arm and the top of said guide means being less than the distance between the uppermost surface of said valve member and the bottom of said guide rod.