When the channel is closed, use the wedge head of the valve rod to expand the ball and compress the valve seat until it is sealed. Loosen the wedge head before rolling the ball, and then the ball will return to its original shape, making a small gap between the ball and the valve seat, which can reduce the conflict between the sealing surface and the operating torque. Pneumatic ball valves can be divided into straight through type, three-way type and right angle type according to their channel positions. The latter two ball valves are used to distribute media and change the flow direction of media.

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