METAL GASKET

PURPOSE:To maintain the high joint sealing pressure under the high-temperature condition by forming a liquidtight metal tube into annular form and non-round form on the section and filling the inside of the tube with the substance which changes from solid phase to liquid phase through the volume expansion due to the rise of temperature. CONSTITUTION:A liquidtight tube 1 made of the heat-resisting alloy such as inconel, stainless steel, etc. is formed into annular form. The sectional shape is formed into a nearly rectangular form having the longer side in the radial direction of the annular tube 1. A metal gasket A is constituted by filling the annular tube 1 with the metal 2 having a low melting point as core member. Said gasket A is heated by the heat transmission due to a variety of fluid having a high temperature which flows in a conduit, and the contact sealing pressure for the joint surfaces f1 and f2 of the sealing objects can be kept high under the high-temperature condition by the tube deformation force in the direction for increasing the thickness of the gasket which is backed-up by the large volume expansion force.