Patent ID: 8632048

Claim:
A diaphragm assembly for use in a flush valve, the diaphragm assembly comprising: a diaphragm having a substantially cylindrical shape with a top surface, a bottom surface, and a side, the diaphragm having a central aperture positioned substantially centrally through the diaphragm; a relief valve retention ring circumscribing the central aperture and extending from the top surface of the diaphragm; at least one by-pass aperture disposed in the diaphragm, the at least one by-pass aperture comprising a passage through the diaphragm; each of the at least one by-pass apertures having a by-pass associated therewith and retainably disposable therein; and the relief valve retention ring having a plurality of relief valve lugs protruding from an inner surface of the relief valve retention ring towards the central aperture, each of the plurality of lugs disposed about the inner surface of the relief valve retention ring and having a right-hand rounded corner and a left-hand angular corner, wherein the plurality of relief valve lugs are positioned such that the right-hand corner of one lug is adjacent to the left-hand corner of another lug.