Why are PTFE lined butterfly valves more corrosion-resistant?

With the rapid development of the petrochemical industry, the demand for valves is becoming more and more abundant. Among them, the corrosion-resistant PTFE lined butterfly valve stands out because of its high cost performance and long service life, and is favored in some special working conditions. However, why are PTFE lined butterfly valves more corrosion-resistant? Come find out today.

In some special working conditions, it is often necessary to transport corrosive media. Therefore, the selection of valves is very important, not only for corrosion resistance, but also for cost performance. However, due to the continuous development of the chemical industry, stainless steel butterfly valves, rubber butterfly valves and enamel butterfly valves, which were once considered to have better anti-corrosion performance, can no longer meet the demand. However, if materials containing rare metals such as Ni, Cr, Ti, Mo, Nb and Pt are used such as platinum and alloys, it is not only expensive, but also pays attention to daily maintenance, but this greatly increases the cost of the valve. At this time, the emergence of PTFE lined butterfly valves solved this problem.

According to the profound research of modern science, it is found that the molecular structure of fluoroplastics contains fluorine atoms, so it has many excellent properties, such as electrical insulation, high heat resistance, oil resistance, solvent resistance and wear resistance, good moisture resistance and Low temperature resistance. These characteristics can withstand almost all corrosive chemical media, including hydrofluoric acid, concentrated sulfuric acid and aqua regia, etc. The material used in the PTFE lined butterfly valve mainly refers to "tetrafluoroethylene". Because of its plasticity, it can be lined in the seat of the cast steel butterfly valve or wrapped outside the disc to isolate the direct contact between the metal and the strong corrosive medium. . This design not only solves the problem that metal materials are not resistant to corrosion, but also solves the disadvantages of fluoroplastics that are not resistant to high pressure. In addition, tetrafluoroethylene is a renewable resource, and its cost is lower than that of metal seat butterfly valves. Its superior cost performance makes it favored by the general public.

PTFE lined butterfly valves have significant advantages, and can be used in the range of -195 to 200 ° C, and have good heat resistance, cold resistance, self-lubrication, chemical stability and electrical insulation, and are suitable for various strong acids, strong alkalis and Corrosive media with strong oxidants.

As a professional valve supplier, POPU Valve will provide you with high-quality products and services according to your needs.