3. Short application cycle of pneumatic rubber lined butterfly valve and pneumatic fluorine lined diaphragm valve for desalted brine
The desalted salt water contains acids or alkalis of lower concentration, which have great corrosion on vulcanized rubber. The erosion of vulcanized rubber is mainly characterized by swelling, embrittlement and low compressive strength. The actual application effect of rubber lined butterfly valve and diaphragm valve is poor. The essence of vulcanized rubber is that it is not resistant to corrosion. The back rubber lined diaphragm valve is improved to be a fluorine lined diaphragm valve with good corrosion resistance, but the pulse damper of the fluorine lined diaphragm valve can not resist the left and right expansion and is broken, leading to reflective damage and shortening the service life of the valve. The effective way now is to solve the problem of special pneumatic ball valve with tap water, which can be used for 5 to 8 years.

What factors should be considered when purchasing pneumatic butterfly valves?
Several elements of model selection
1： Size: nominal diameter of hose, selection of connector type (mainly flange connection, thread connection, quick connector connection), size of pneumatic butterfly valve, and hose length.
2： The pressure shall be based on the practical working pressure of the hose, and then the nominal diameter and pressure gauge of the corrugated pneumatic butterfly valve shall be inquired to determine whether the pneumatic butterfly valve of stainless steel mesh sleeve type can be used.
3： The chemical properties of the medium recommended in the medium hose determine the material of each part of the hose according to the corrosion resistance of the hose material.
4： The working temperature and range of the medium in the temperature hose; Ambient temperature when the hose is working. In case of high temperature, it is necessary to confirm the pressure after temperature correction according to the temperature correction coefficient of working pressure under high temperature of pneumatic butterfly valve, so as to ensure the correct pressure level is selected.
5： The status is based on the status of the hose when it is used, referring to the correct application and installation method of the pneumatic butterfly valve and the optimal length of the hose during settlement compensation, the length calculation of the hose in various motion states, and the minimum bending times and minimum bending radius of the hose. The parameters correctly select the hose length and correctly install it.