Patent ID: 7513483

Claim:
A valve body and seal assembly having a longitudinal axis of symmetry and comprising: a peripheral seal retention groove spaced apart from the longitudinal axis, said seal retention groove having first and second opposing groove walls; a valve body impact area for contacting a valve seat, said impact area being peripherally located on said first opposing groove wall of said peripheral seal retention groove; circular serrations on said first and second opposing groove walls of said peripheral seal retention groove; and an elastomeric seal cast-in-place in said peripheral seal retention groove, said elastomeric seal comprising: a first seal section comprising a peripheral frusto-conical surface for contacting a valve seat, said frusto-conical surface being adjacent to said valve body impact area and said first seal section comprising relatively high modulus polyurethane; and a second seal section comprising a peripheral surface adjacent to said peripheral frusto-conical surface, at least a portion of said second seal section comprising polyurethane having a lower modulus than said relatively high modulus polyurethane.