Patent ID: 6173457
Filing Date: 2001-01-16
Classification: E03D

Abstract:
Flapper-type toilet flush valve comprising:a flapper body component having an upper surface and a lower surface;a float member component assembled by bayonet type mounting to the flapper body component;an annular flange extending from the float member component near its top edge, a top surface of the flange forming a first sealing surface;a portion of the lower surface of the flapper body component forming a second sealing surface;a sealing ring having an inner diameter, an outer larger diameter, upper and lower surfaces there-between, and a preformed, raised circular step on the upper surface thereof offset from and positioned between the inner and outer diameters, wherein the preformed, raised circular step is being disposed between the first and second sealing surfaces; anda number of slightly raised concentric rings extending from the second sealing surface, wherein the preformed, raised circular step is fitted in between the concentric ring for centering the seal ring onto the flapper body component and for providing an air tight seal between the flapper body component and the float member component.