Third, the selection range of electric on-off butterfly valves is widely used in many industries in China, such as industrial process automatic control systems in water treatment, power, municipal engineering, paper making, chemical industry, petroleum, light industry, environmental protection and food industries. 　　　　

According to the actual requirements, pneumatic butterfly valves include pneumatic hard seal butterfly valves and pneumatic soft seal butterfly valves, which have different sealing performance; Pneumatic butterfly valves include pneumatic flange butterfly valves, pneumatic wafer butterfly valves and other butterfly valves with different connection modes according to the connection mode with the pipeline; Pneumatic butterfly valve can adapt to different pressures, including pneumatic high-pressure butterfly valve, pneumatic medium pressure butterfly valve and pneumatic low-pressure butterfly valve. From this, we can see that the question of how long the production cycle of pneumatic butterfly valves needs to be answered is not confused, but needs to be differentiated in detail.