| 摘要 |
PROBLEM TO BE SOLVED: To provide a pipe coupling to prevent a pipe, the size of which is decreased, from sliding over a gasket even when comparatively low rotation torque is exerted. SOLUTION: A pipe coupling 10 in a first working form is formed that by threadedly engaging a coupling body 15 with a fastening member 16, the flow passage 17 of a fastening member 16 is coupled to the flow passage 12 of a pipe 11 moved in a non-rolling state at the internal part of the coupling body 15. To prevent leakage from a coupling surface between flow passages 12 and 17, a gasket 19 is nipped at a coupling surface between the flow passages 12 and 17. In this case, also the outer peripheral side of a coupling surface between the flow passages 12 and 17, the gasket 19 is nipped by an inner ferrule 13 grasped at the pipe 11 and a fastening member 17. Thus, when rotation torque is exerted on the pipe 11, on a coupling surface between flow passages 12 and 17, rotation of the pipe 11 is prevented by a friction force generated between the pipe 11 and the gasket 19, and further on the outer peripheral side of the coupling surface between the flow passages 12 and 17, the rotation thereof is prevented by a friction force generated between the pipe 11 and the gasket 19 through the inner ferrule 13.
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