Ball valve and butterfly valve is the biggest difference between the opening and closing piece is a piece of board, which is a ball valve, butterfly valve plate and the ball valve is rotated around its own axis for movement; gate valve for valve plate movements along the axis of movement; butterfly valves and gate valves to regulate flow through the opening degree; ball is not easy to do this.

Butterfly valve is characterized by open and close faster, simple structure, low cost, but the rigor and pressure are not good. Similar characteristics and gate valve, however, resistance by the volume and open and close limits; it is difficult to achieve large-caliber.

Butterfly structure principle is particularly suitable for production of large diameter butterfly valve butterfly valve plate installed in the pipe diameter direction. Cylindrical channel in the valve body, disc-shaped disc around the axis of rotation, rotation angle 0