Patent ID: 7922216

Claim:
A threaded union comprising: a nut having a box thread that engages a pin thread formed externally on a first subcomponent of the threaded union and an upper annular shoulder that extends radially inwardly from a top of a main body of the nut, the upper annular shoulder abutting a flange that extends radially outwardly from an adapter collar that sits on an annular shoulder of a second subcomponent of the threaded union; a mating end of the first subcomponent comprising a first annular groove that mates with a complementary second annular groove in a mating end of the second subcomponent, the complementary first and second annular grooves respectively having a sloped annular outer face that is convergent to a respective planar bottom surface of the respective annular grooves; and a metal ring gasket received in the respective annular grooves, the metal ring gasket having a planar top face, a planar bottom face that is parallel to the planar top face, a cylindrical outer face that is perpendicular to the top and bottom faces, and an annular converging sloped surface between each of the planar top face, the planar bottom face and the cylindrical outer face, the metal ring gasket being elastically deformed, without any plastic deformation, by contact between only the respective sloped annular outer faces and the respective annular converging sloped surfaces when the first and second subcomponents are drawn together by the nut.