Pneumatic flange segment ball valve is a high-performance control valve with excellent regulation performance and strong versatility. This series of control valves includes two types: VD wafer type and VF flange type, which are mainly used as control valves and can also be used as on-off valves. This series of valves has equal percentage flow characteristics, a wide control range, and a particularly stable control process. The valve core with a V-type notch which has strong shear force, especially suitable for situations with viscous media, fibers or particles. This product is widely used in automatic control systems in industrial sectors such as pulp and paper, biochemistry, chemical fiber, chemical industry, environmental protection, mining, etc.