Patent ID: 6431613
Filing Date: 2002-08-13
Classification: F16L

Abstract:
A pipe connection comprising:a connecting member having a first end face, a first conical bore starting to taper from the first end face, said first conical bore defining a first cone angle, an axial bore having a desired length in said connecting member, a circular cylindrical bore adjoining the first conical bore in said connecting member, and an outer face of said connecting member having a threaded portion; a nut including a threaded bore matching the threaded portion of the connecting member, a second conical bore in said nut following the threaded bore, said second conical bore tapering in a direction opposite to that of the first conical bore of the connecting member, said second conical bore defining a second cone angle, and a through bore through said nut; a pipe guided through the through-bore of the nut, said pipe defining a longitudinal axis, a cylindrical pipe projection on said pipe extending into the circular cylindrical bore of the connecting member, a connecting portion formed on said pipe following the pipe projection, said connecting portion including a first conical tensioning face cooperating with the first conical bore of the connecting member, said first conical tensioning face defining a third cone angle, said third cone angle being greater than the first cone angle of the first conical bore, an axial length of overlap of said first tensioning face with the first conical bore is smaller than 15% of the axial bore length of the first conical bore; said connecting portion including a second conical tensioning face which cooperates with the second conical bore, said second conical tensioning face defining a fourth cone angle which corresponds to the second cone angle and an annular recess on the radial inside of the first tensioning face, said annular recess starting from an end positioned in the region of the smallest cone diameter of the first tensioning face and said recess extending over at least part of the axial length of said pipe projection.