| 摘要 |
When a valve body of a coupling member is moving toward a fluid passage closed position, if the valve body becomes inclined, the present invention prevents a sealing ring of the valve body from coming into friction engagement with a conical wall surface of the fluid passage and coming to a stop. The valve body has a valve head provided with a disk-shaped portion, a sealing ring, and a sealing ring support that supports this sealing ring against the valve head; and an angle that a line tangent to a disk-shaped member of the valve head and sealing ring makes with respect to the axis of the valve body is less than or equal to an angle that the conical wall surface, forming the valve seat of the fluid passage, makes with respect to the axis of this fluid passage.
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