Patent ID: 8286934

Claim:
A flush valve system comprising: a flush valve body having a water inlet and a water outlet, the water inlet positioned on a side of the flush valve body and the water outlet positioned at a bottom of the flush valve body; a barrel having a hollow passage and disposed within the flush valve body, the barrel forming a vertical pathway for water from the water inlet to pass to the water outlet, a skirt of the barrel and the flush valve body in communication to form a seal between the water inlet and the water outlet and defining an inlet chamber; a diaphragm disposed at an upper end of the barrel, sealing the inlet chamber from the hollow passage and defining a control chamber above the diaphragm; the diaphragm having a top surface, a bottom surface, and a side and having a central aperture defining a disc and a relief valve retention ring circumscribing the central aperture and fixedly extending from the top surface of the diaphragm, the disc and the relief valve retention ring both include a unitary rigid insert, the diaphragm further including at least one by-pass aperture through the diaphragm positioned between the side of the diaphragm and the relief valve retention ring, each of the at least one by-pass aperture configured to retain a by-pass, the by-pass providing a passage from the inlet chamber to the control chamber allowing equilibration of pressure; a relief valve seat positioned on the top surface, the relief valve seat positioned about the central aperture; a relief valve seated on the diaphragm and having a valve stem extending downward therefrom through the diaphragm into and extending beyond a guide; and the guide coupled to the diaphragm and extending downward from the diaphragm into the barrel, the guide being a generally cylindrical hollow tube in communication with the central aperture.