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The pneumatic butterfly valve is equipped with a raw material weighing system. The whole raw material preparation process is fully automatic. The raw material release valve used in the raw material preparation vehicle should preferably use an aerodynamic three eccentric valve. The medium in the pipeline is mainly stone powder with very small particle size. After using for a period of time, the powder inside the valve will leak, causing the powder to accumulate and stack on the workbench, Because the powder is very small and has a certain viscosity, although the vehicle equipped with raw materials is equipped with a vibrating motor, a small amount of raw materials will eventually adhere to the inner wall of the tank and the valve. When the valve is closed, the raw materials will be stuck around the sealing surface, causing the valve to not be fully closed, and the final reassembly will lead to the leakage of raw materials and powder, The sealing surface of the valve will be greatly worn and even have deep grooves.