Patent ID: 8485496

Claim:
A flush valve assembly comprising: an upper housing; a lower housing sealingly attached to said upper housing; a discharge receiver seated within said upper housing, said discharge receiver including a plug opening; a sleeve seated within said lower housing; a main valve assembly positioned within said sleeve; a main diaphragm sealingly connected between said main valve assembly and said sleeve, whereby said main diaphragm and said main valve assembly, in combination, define a control chamber on an upper side thereof and an inlet region on a lower side thereof; a flow insert positioned within said main valve assembly; a discharge plug sealingly connected to an upper portion of said flow insert, said discharge plug including a flange portion configured to be received in said plug opening in said discharge receiver; a second diaphragm, secured between said flow insert and said discharge plug, for sealingly connecting said flow insert and said discharge plug with said main valve assembly; and a flow restriction assembly associated with said main valve assembly, whereby said flow restriction assembly permits fluid from said inlet region to gradually enter said control chamber until pressure is equalized between said inlet region and said control chamber; wherein when said flush valve assembly is in a non-pressurized condition, said flange portion of said discharge plug is not seated within said plug opening of said discharge receiver; and wherein when said flush valve assembly is in a pressurized condition, said flange portion of said discharge plug is seated within said plug opening of said discharge receiver.