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Fixed ball type V incision of V type pneumatic piston type ball valve with special shape and adjustable metal seat structure, when the valve is closed, the wedge shear formation of V type incision and valve seat, can prevent dirt between the ball and seat the death card, with self cleaning function, especially suitable for containing fiber slurry, sewage and viscous particles of the medium, with the valve positioner can achieve continuous adjustment, and the flow resistance is small, wide adjustment range, the valve is widely used as a kind of high quality.

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