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A ball valve which are the main connection

A one-piece ball valve is a plug to the ball fixed, so as to facilitate his maintenance.
Two-piece ball valve is fixed by the two bodies holding the ball, the maintenance is relatively complex, the middle of the tightness of the screw is critical, related to whether the leak.
Three-piece ball valve with a two-piece ball valve similar to the ball, but the middle of a ball more body, and then by both sides of the neck flange caught
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