| 摘要 |
A pipe coupling is provided that facilitates an operation of opening or closing a ball valve and suppresses damage to a cylindrical seal member by the ball valve when rotated, thereby enabling an improvement in durability. A socket fluid passage ( 4 ) in a socket ( 1 ) is opened or closed with a ball valve ( 5 ). A cylindrical seal member ( 11 ) is disposed in a primary fluid passage portion ( 4 a) of the socket fluid passage ( 4 ) in such a manner as to be in pressure contact with the ball valve ( 5 ) to seal between the ball valve ( 5 ) and the inner wall of the socket fluid passage ( 4 ). The ball valve ( 5 ) is rotatable to open when the socket ( 1 ) and a plug ( 2 ) are locked to each other by a lock mechanism ( 16 ). The ball valve ( 5 ) is provided with a sub-valve bore ( 33 ) that allows fluid in the primary fluid passage portion ( 4 a) to be delivered to a secondary fluid passage portion ( 4 b) of the socket fluid passage ( 4 ) through the ball valve ( 5 ) before a valve bore ( 7 ) of the ball valve ( 5 ) opens into the socket fluid passage ( 4 ) when the ball valve ( 5 ) is rotated.
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