2 Structural characteristics
2.1 The hemispherical body of the hemispherical double eccentric semi pneumatic ball valve adopts the double eccentric design, with reliable sealing effect, instant separation, small torque and long service life. It can be used in the harsh working conditions of conveying granular media. The structure principle is that the center line of the hemisphere is offset from the center line of the valve stem, and offset from the center line of the valve seat. When fully opened, the sphere is completely disconnected from the valve seat, and there is a certain gap. The radius of gyration is divided into long radius and short radius. The tangent line of the rotation track in the long radius will be formed with the sealing surface of the valve seat θ Angle, when the valve is opened and closed, the hemisphere has a gradual separation and gradual extrusion effect on the valve seat surface, thus reducing the mechanical wear and scratches between the valve seat and the hemisphere during opening and closing, and improving the service life.

The pneumatic butterfly valve continuously improves its sealing performance, not only improving the quality of the product itself, but also respecting customers. At present, the market is very interested in this product. Only we can constantly improve the sealing of the product and improve it in all aspects, so that the market has a stronger acceptance of the product. It is not only good for customers, but also a very good guarantee for product production personnel.