| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-pressure pipe joint and a high-pressure valve suitable for a high-pressure fluid flow passage, capable of exhibiting high sealability and ensuring the prevention of the leakage of an extra-high pressure fluid while preventing deformation and breaking of a gasket and connection end portions due to an excessive fastening force and improving durability, and facilitating pipe installation.SOLUTION: Connection end portion surfaces 15 of a pair of tubular connection members 10 are sealed and connected by fastening a screw member 12 via a gasket 11, the gasket 11 is formed of a metal lower in hardness than the connection end portion surfaces 15, a narrow flat seal portion 20 is formed on an innermost side or near the innermost side of each connection end portion surface 15, an obtuse tapered surface 21 is formed along an outside diameter of the narrow flat seal portion 20, the connection end portion surfaces 15 are sealed in a state of widening a seal portion 22 sealed to the gasket 11 by the narrow flat seal portion 20 and the obtuse tapered surface 21 by a magnitude of a fastening load at a time of fastening the screw member 12, and sealability is maintained even against an extra-high pressure fluid by a seal structure in which the obtuse tapered surface 21 on the outside diameter of the narrow flat seal portion 20 acts as a stopper at a time of fastening the screw member 12 at a maximum fastening load. |
