Patent ID: 8851194

Claim:
A wellhead assembly with an axis, comprising: an outer wellhead member having a bore; an inner wellhead member located in the bore; a seal ring between and in sealing engagement with the inner and outer wellhead members, wherein the seal ring has an inner annular member and an outer annular member circumscribing a portion of the inner annular member, a bellows on a lower end of the seal ring, the bellows having undulations that meet at a point and form gaps at an opposite end of the undulations and being axially contractible, the undulations having outer surfaces that expand outward radially into the outer wellhead member and inner surfaces that contract radially inward into the inner wellhead member; and an annular energizing ring having a lower end insertable between the inner and outer annular members of the seal ring, so that when the lower end of the energizing ring is inserted between the inner and outer annular members of the seal ring, outer walls of the inner and outer annular members of the seal ring are urged radially apart into sealing engagement with the inner and outer wellhead members.