Pressure actuated metal-to-metal seal

A seal assembly for a pressurized system for sealling a cylindrical conduit received within a cylindrical bore comprising, in combination, a tubular body having an axis, a cylindrical outer surface, an end, an inner reduced diameter cylindrical surface defined on said body of lesser diameter than said exterior surface and intersecting said body end, and an abutment defined on said body adjacent said inner surface and axially spaced from said end, an anvil ring circumscribing said inner surface engaging said abutment and having a conical anvil surface facing said body end, an annular conical deformable metal seal ring having inner and outer circular seal surfaces circumscribing said inner body surface having deformable radially expanded and retracted conditions, said seal ring having an expanded radial dimension greater than the radial dimensional difference between said body outer and inner surfaces, an annular piston ring circumscribing said body inner surface and axially displaceable thereon, said piston ring including a conical seal ring engagable surface disposed toward said seal ring and a pressure surface disposed toward said body end acted upon by the pressure within the system to axially displace said piston ring toward said seal and anvil ring, and retaining means mounted on said body limiting movement of said piston ring toward said body end, pressure within the system displacing said piston ring toward said anvil ring to deform said seal ring from its normal retracted condition to its expanded condition whereby said seal ring inner seal surface sealingly engages said body inner surface and said seal ring outer seal surface sealingly engages the bore receiving said body.