Patent ID: 8033577

Claim:
A flared screw fitting comprising: a pipe expanded in an end section into a tulip flare; and a connecting piece having a conical stop face situated on an end section, which is adjoined in the direction of a forward front face of the connecting piece by a groove for an elastic sealing ring and which the pipe presses against using an internal mantle surface of the tulip flare, by which, in the final mounted state of the screw fitting, the sealing ring is pressed into the groove, wherein the tulip flare, using a union element engaging an external mantle surface of the tulip flare and interacting via a union element threaded section with a corresponding threaded section on the connecting piece, may furthermore be pressed against the conical stop face of the connecting piece in the course of tightening the screw fitting, wherein in a hand-tight pre-mounted state of the screw fitting, an internal mantle surface of the union element contacts the external mantle surface of the tulip flare only in a first area of the tulip flare, the first area having a first area smallest diameter smaller than any other diameter of the first area of the tulip flare, wherein the conical stop face of the connecting piece has a stop face smallest diameter smaller than any other diameter of the conical stop face, and wherein the first area smallest diameter is larger than the stop face smallest diameter, wherein the conical stop face of the connecting piece is only formed by a face of the connecting piece situated behind the groove for the sealing ring and in the final mounted state a gap exists between the internal mantle surface of the tulip flare and an edge in a transition from the groove to the forward front face of the connecting piece; and wherein the connecting piece is constructed in two pieces, the two pieces comprising an external union nut rotatable around an internal main part, wherein the external union nut and the internal main part are coupled to one another to resist tensile strain via an annular wire section, and wherein the annular wire section engages in the union nut and the internal main part.