The pneumatic wafer butterfly valve features a disc-shaped valve plate that moves with the valve stem to open, close, or regulate the fluid flow. The disc is installed across the pipe diameter and rotates around its axis within the cylindrical body of the valve. The rotation angle ranges from 0° to 90°, with the valve being fully open at 90°. These valves are known for their simple... https://www.chinavalvesflange.com/