2. The problem of grinding has been a long time. For the electric three-way ball valve whose quality needs to be improved, it may leak due to the aging of the valve core and valve seat, so the piston and cylinder body of the cylinder will also have the same problem. At this time, grinding should be carried out. As for grinding, it can be done manually or mechanically. The emery used for grinding shall have the right grain size, and the submerging force shall be appropriate and even. After grinding, polishing can be carried out as long as the smoothness and accuracy are met. 　　　　

Ball valve is a new type of valve produced in the 1950s. After decades of development, ball valve has become a widely used valve in many fields. Pneumatic high-pressure ball valve has been widely used in petrochemical industry, aerospace industry, pipeline transportation, food, construction and other industries.