Spool rotation. The ball valve spool is a perforated ball, when the spool rotates, the throttling area change. According to the shape of the hole, is divided into two types of O-ball and V-shaped ball. Ball valve flow capacity is large, the flow resistance is small, both for fluid throttle adjustment (continuous control), the fluid cut-off control (switching control) can also be used. Typically, adjustable valve ratio is about the same diameter control valve several times. The ball valve with rotary valve cut-off function, and suitable for fiber, pulp and viscosity of the fluid control.pneumatic auto drain
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