Patent ID: 7654585

Claim:
A threaded union for providing a fluid-tight, metal-to-metal seal between respective mating ends of first and second subcomponents of a fluid conduit, the threaded union comprising: a single nut that interconnects the first and second mating ends; the mating end of the first subcomponent including a first annular groove that mates with a complementary second annular groove in the mating end of the second subcomponent, said complementary first and second annular grooves respectively having a sloped annular outer face that is convergent to a respective planar annular bottom surface of the respective annular grooves; and a metal ring gasket received in the respective annular grooves when the mating ends are interconnected, the metal ring gasket having a central axis, a single planar top face, a single planar bottom face that is parallel to the planar top face, a cylindrical outer face that is coaxial with the central axis and perpendicular to the top and bottom faces, and single annular converging sloped surfaces between each of the planar top face, the planar bottom face and the cylindrical outer face, the metal ring gasket being oversized with respect to the respective sloped annular outer faces of the annular grooves to an extent that the metal ring gasket is elastically deformed, without plastic deformation, by contact with the respective sloped annular outer faces of the respective first and second annular grooves and the respective annular converging sloped surfaces of the metal ring gasket to provide the fluid-tight seal between the first and second subcomponents after the first and second subcomponents are interconnected by the single nut.