| 摘要 |
PURPOSE: A shape of a packing is modified to maintain sealing of a ball valve, and slipping of the packing member is prevented to improve connection of the ball valve and the pipe. CONSTITUTION: A pipe connector of a ball valve comprises an inner surface(32) of a screw portion(31) having a first diameter cylinder and a second diameter cylinder. A packing member(33) is inserted to the outside of the pipe and connected to the inner surface of the screw portion. An auxiliary washer(35) is inserted to outside of the pipe, and presses the packing member to inner surface of the screw portion. A fixing washer(36) is attached to the outside of the pipe.
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