Patent ID: 7624991

Claim:
A seal ring sealing between first and second members each having a through bore, the seal ring and first and second members comprising: each first and second member having a radially outer circumferential groove surface inclined outwardly in a direction toward the seal ring, and a radially inner circumferential groove surface inclined inwardly in a direction toward the seal ring; securing members arranged circumferentially about the first and second members to secure the first member to the second member; and a seal ring including a metal seal body having a yield strength of 30,000 psi or less engaging each of the outer groove surfaces on the first and second members when the securing members secure the first member to the second member, the metal seal body having a radially inward facing body surface spaced axially between an uppermost body surface and a lowermost body surface, the metal seal body being flexed inward when the securing members are moved to secure the first member to the second member, and a metal flexible flange radially inward at the seal body such that a cantilevered end of the flexible flange provides substantially line contact sealing engagement with the inner groove surface on a respective first and second member, a spacing between the flexible flange and the seal body projecting radially outward of the inward facing body surface to increase flexibility of the flange and providing for fluid pressure energization of the flexible flange, the spacing including a minimum spacing between a radially outward planar surface on the flexible flange and a radially inward planar surface on the metal seal body, the minimum spacing being greater than a maximum thickness of the metal flexible flange, and the flexible flange flexed outwardly and being deformed beyond its elastic range when the securing members secure the first member to the second member.