Patent ID: 7516754

Claim:
A flush valve diaphragm comprising a body portion and a peripheral sealing portion, the body portion being flexible and having a central passageway, the peripheral sealing portion comprising an integral filter integrally molded in the flush valve diaphragm and made of the same elastomeric material as the flush valve diaphragm, wherein water is filtered via the integral filter before passing through the sealing portion of the flush valve diaphragm, wherein the peripheral sealing portion further comprises a sealing ring with a thickness greater than the body portion extending along the periphery of the flush valve diaphragm; a first integral ring on a first side of the flush valve diaphragm radially spaced from the sealing ring; and a second integral ring on a second side of the flush valve diaphragm radially spaced from the sealing ring, wherein the integral filter is located between the sealing ring and the first integral ring and between the sealing ring and the second integral ring, wherein the peripheral sealing portion further comprises a bypass chamber positioned between the first integral ring and the sealing ring, an exit chamber positioned between the second integral ring and the sealing ring; and a bypass orifice extending from and allowing fluid communication between the bypass chamber and the exit chamber, wherein the integral filter comprises a plurality of filter orifices extending from the first side of the diaphragm, through the diaphragm to the second side of the diaphragm, and wherein the first integral ring defines a plurality of circumferentially spaced support grooves, said flush valve diaphragm further comprising a plurality of radially extending chamber walls circumferentially spaced apart, and a plurality of chambers defined by at least one of said support grooves, a respective pair of chamber walls, a portion of the first integral ring, and a portion of the sealing ring, each chamber wall extending from the sealing ring to the first integral ring, wherein each chamber includes a set of the filter orifices in fluid communication with a circumferential passageway located between the sealing ring and the second integral ring.