Applicable pressure of pneumatic butterfly valve 
1. The pilot operated pneumatic butterfly valve is applicable to steam, gas and water media of various pressures, specifications and temperatures. If it is made of stainless steel and acid resistant steel, it can be used for various corrosive media.
2. The pilot metal bellows pneumatic butterfly valve is suitable for bottomhole pressure, medium and small diameter steam, gas and other media; Pneumatic stop valve
3. Pilot diaphragm pneumatic butterfly valve is applicable to bottom pressure, high pressure, medium and small diameter steam or water medium;
4. The channel pressure fluctuation of pneumatic butterfly valve shall be controlled within 80~105 of the channel pressure input pressure. If it exceeds, the characteristics of the preshrinking pressure will be damaged;
5. Generally, the rear valve pressure of pneumatic butterfly valve should be 0.5 times lower than the front pressure;
6. Each yellow spring of pneumatic butterfly valve is only applicable to a certain range of outlet pressure, and the yellow spring should be replaced.
7. When the medium working temperature is high, the pilot piston engine pneumatic butterfly valve or pilot metal bellows pneumatic butterfly valve is generally used; Emergency shut-off valve
8. When the medium is gas or water wetted, quick acting diaphragm pneumatic butterfly valve or pilot diaphragm pneumatic butterfly valve is usually selected;
9. When the medium is steam, pilot piston engine or pilot metal bellows pneumatic butterfly valve shall be used;
10. In order to facilitate actual operation, adjustment and maintenance, pneumatic butterfly valve shall be installed on the horizontal pipe.
