Sanitary butterfly valves are polished by standard electronic polishing, with smooth surface to ensure cleanliness, no media accumulation area, and no potential pollution. Quick disassembly and assembly of valves can make the opening and maintenance of valves fast and easy, and shorten the downtime of the process. Widely applied in food, pharmaceutical, cosmetics, clean steam, alcohol, beverage, biochemical industrial process control occasions. The utility model has the advantages of compact structure, convenient assembly and disassembly, etc.