The good cut-off function reflects the internal quality of the valve. The standard leakage rate of straight stroke valve is usually 10~10; The standard leakage rate of full function ultra light control valve is 10, which is 100~1000 times higher than that of single and double seat valves and sleeve valves.

2. According to the flow characteristics of pneumatic butterfly valve. Of course, in order to ensure the work efficiency, the corresponding flow characteristics cannot be ignored. If there are any requirements for the pneumatic butterfly valve in the work, the pneumatic butterfly valve that meets this requirement must be selected according to such flow requirements. At this time, what the pneumatic butterfly valve can do and what work can be better controlled become crucial.