| 摘要 |
PURPOSE: A ball valve is provided to prevent the leakage of fluid caused by the inflation of a valve body by firmly coupling the valve body to valve seats. CONSTITUTION: In a ball valve, a valve body is connected to a pipe, and has a space therein. Screw threads(24) are formed at the valve body. A pair of ball support units(60,62) have hole(60a,62a) communicated with a through hole formed at a ball(30), and are tightened to each other along the screw threads so that valve seats(40,42) are stably in contact with the surface of the ball. A pair of sealing units(50,52) are interposed between the outer circumference of the ball support units and the inner circumference of the valve body, and are extended in a circumferential direction when the valve body is inflated.
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