Lining fluorine pneumatic diaphragm valve res in desalted water medium?

60 s of pneumatic valve sleeve, extensive use at home and abroad in the 70 s, 80 s, the introduction of the petrochemical plant of sleeve of pneumatic valve ratio is larger, at that time, many people think, sleeve pneumatic valve, pneumatic valve can replace single, two-seat became the second generation product. By now, is not the case, single-seat pneumatic valve, two-seater pneumatic valve, pneumatic valve sleeve are equal. This is because the sleeve pneumatic valve is improved form of throttle, stability, and safeguard in single-seat pneumatic valve, but it weight, prevent leakage and indicators are consistent with single, two-seat pneumatic valve, it can replace single, two-seat pneumatic valve? So, can only be used together.

1, why the desalting water use rubber lining pneumatic valve, short service life of lining fluorine pneumatic diaphragm valve?
desalted water medium containing low concentration of acid or alkali, they have larger corrosion in rubber. Rubber corrosion performance for expansion, aging, low intensity, with rubber lining of the pneumatic valve, pneumatic diaphragm valve use effect is poor, its essence is the rubber is not caused by corrosion. After the rubber lining pneumatic diaphragm valve to improve the corrosion resistance of good lining fluorine pneumatic diaphragm valve, but lining fluorine pneumatic valve diaphragm and diaphragm are folded up and down and were broken broken, mechanical damage, the service life of pneumatic valve. Now is the best way to deal with water special pneumatic valve, it can be used to 5 ~ 8 years.

2, why do you say type selection is more important than the calculation?
calculation and selection of comparison, selection is much more important and more complex. Because computing is just a simple formula, its itself is not the accuracy of the formula, but in a given by process parameters are accurate. Selection involves the content is more, a little careless, will lead to improper selection, not only a waste of manpower, material resources, financial resources, and use effect is not ideal, bring some use problems, such as reliability, quality of life, running, etc.