Special industrial butterfly valve is characterized by high temperature resistance, high applicable pressure range, large nominal diameter of valve, carbon steel valve body, and metal ring instead of rubber ring for sealing ring of valve plate. The large high-temperature butterfly valve is welded with steel plate and is mainly used for the flue and gas ducts of high-temperature media.

Therefore, the surface roughness of the sphere is greatly improved. For example, if the material is 1CrlgNi9Ti, turning to the upper limit of the nominal size, the surface roughness Ra is 6.3 m, and the roundness error is 36 pro, the machine speed is 240 r/min, and the honing head speed is 60 m/rain. 180 brown corundum stone. After honing for 2 minutes, the surface roughness R value of the sphere can reach 0.8 m and the roundness error F is 4 m. In order to ensure equal honing effect, it is better to make the honing head or ball rotate reversely for half of the whole honing process. The ball honing device has simple structure, convenient operation, no special equipment is needed, and the ball can be honed on an ordinary lathe, which is particularly suitable for batch production. If the honing head is replaced, the device can hon the pneumatic ball valve ball with a nominal diameter of 50~150ram. It has obvious technical and economic benefits for improving the finishing efficiency of the sphere, improving the surface roughness and geometric shape accuracy of the sphere.