Patent ID: 7537244

Claim:
A fluid fitting assembly comprising a receiving member, a fitting member, and a seal member; wherein: the receiving member comprises a body and a port in the body, the port including an internal thread section and a chamfer section between a port-surrounding surface of the body and the internal thread section; the fitting member comprises a head and a shank, the shank including an external thread section and an undercut section between the head and the external thread section; the fitting member is coupled to the receiving member and the respective thread sections are screwed together whereby the chamfer section of the receiving member and the undercut section of the fitting member form a chamber in the port within which the seal member is positioned; the seal member comprises a ring portion and a shoulder portion extending radially from a head-adjacent region of the ring portion; the outer radial surface of the ring portion forms a chamfer-seating surface which seats against the chamfer section of the receiving member; the head-adjacent axial surface of the shoulder portion forms an undercut-seating surface which seats against the undercut section of the fitting member; the ring portion has an interference geometry relative to the chamfer section of the receiving member and/or the shoulder portion has an interference geometry relative to the undercut section of the fitting member, whereby the seal member acts in a spring-like manner, pressing the seating surface against the chamber section and the undercut section, respectively; and wherein, when the port in the receiving member communicates with a volume of pressurized fluid, the inner radial surface of the ring portion and the thread-adjacent axial surface of the shoulder portion form a fluid-contacting surface against which fluid will push to further urge the seating surfaces towards the chamfer section and the undercut section; wherein the ring portion has an interference geometry relative to the chamfer section of the receiving member having an interference overlap in the range of 0.001 to 0.010 inch.