JOINING AND SEALING DEVICE WITH METALLIC LIP JOINING SECTION

摘要

PURPOSE: To use a junction and sealing device having a metallic lip joint in the environment having high vibration and a high temperature by providing a nozzle element made of a metal or metallic alloy that is compatible from a welding point of view with a material of a pipe element to which it is joined by welding and an end piece having an axial cross-section in the shape of a horizontal V so as to define an elastic lip. CONSTITUTION: A nozzle element 1 is welded on a pipe element T at a position 12, and a flange join ring 10 of the element 1 operates together with a shoulder part 41 of a tightening nut 4 through a face 11. An end piece provided with an elastic lip 23 is diffusion-welded on a free end part of the element 1. An axial cross section of the end piece is in the shape of horizontal V to form a hollow division 22 and is directed toward the direction of inner side of the pipe. Consequently, if internal pressure of the pipe is larger than external pressure, this device is self-tightened for the lip 23. The end piece is pressed against a front surface 32 at a tip of a junction element 3. The junction element 3 is connected with a pipe element T' by a screw thread 5. The element 3 is provided with a screw thread part 32 acting together with a screw thread 42 of the nut 4.