Patent ID: 9145990
Filing Date: 2015-09-29
Classification: F16L

Abstract:
1. A fluid coupling comprising: first and second coupling members including respective fluid paths communicating with each other; a metal annular gasket interposed between butted end surfaces of both the coupling members; and a screw means that couples the coupling members to each other, the butted end surface of each coupling member having an annular sealing protrusion and an anti-overfastening annular protrusion protruded further than the sealing protrusion, wherein at least one of the anti-overfastening annular protrusions has a communication path that communicates an internal space of the anti-ovetfastening annular protrusions in which the gasket is arranged with an external space of the anti-ovetfastening annular protrusions which is an inner space of a nut coupling the coupling members to each other when both the anti-overfastening annular protrusions butt against each other, wherein a test hole for leak test is formed in the nut.