The grinding inspection shall be carried out until the color is uniform and consistent with the naked eye. This step is very important and must be done in place. The grinding work must be treated strictly and kept clean. After the first rough grinding, it should be cleaned before entering the next level of grinding. There are many grades of grinding carborundum, and the grinding process can be selected according to the size of the ball, geometric changes and customer requirements. The grinding work is mainly wet grinding. The dry grinding is difficult to ensure the geometric accuracy because of the harsh working environment requirements of the micro powder, which is easy to agglomerate and causes uneven removal. Therefore, it is not recommended to adopt it at present. The removal mechanism of the grinding work is to roll, crush and scratch the surface with sand particles of a certain size that are larger than the hardness of the workpiece and with acute angles and irregular myopia. To make micro cutting movement. The cutting mechanism with many micro crushing points is characterized by small cutting stress, large heat dissipation area, small thermal deformation, etc., so the precision is high. The characteristics of grinding work are fine and even, and the cleanliness requirements are particularly high. The next level of grinding must not be mixed with the sand particles of the previous level. If conditions permit, all equipment and research tools shall work separately to avoid cross contamination. Grinding is an infinite pursuit, which can reach the mirror. The ball grinding is the most difficult work, and the ideal ball grinding is to complete the perfect work by mechanical equipment. Only scientific mechanical structure can meet the spherical movement track, and the ideal ball can meet the requirements of hard seal pneumatic ball valve.

Now, in our life, this pneumatic butterfly valve has been widely used. It is generally composed of angle travel electric actuator and butterfly valve, which are mechanically connected, but are jointly formed after installation and commissioning. Of course, it is also divided into switching type and regulating type according to the action mode. This will be analyzed in detail.