With the rapid development of the modern petrochemical industry, some of the media used in special operating conditions are highly corrosive. Even stainless steel valves and lining rubber can not meet the needs of enamel valves. If the use of Hastelloy, Monel or Alloy No. 20 as the valve material, due to its large amount of Ni, Cr, Ti, Mo, Nb and Pt and other rare metals, its limited resources, expensive.
According to the results of modern science and technology, fluorine plastic molecular structure with fluorocarbon bond and its shielding effect, with excellent corrosion resistance, high (low) temperature, non-sticking and electrical insulation, almost all chemical media can resist (Including hydrofluoric acid, concentrated sulfuric acid and aqua regia) corrosion.
Fluoroplastics plastic processing principle, the fluorine plastic lined in the ordinary steel shell to cut off the metal contact with the strong corrosive media, both to solve the problem of low strength and can not withstand the high pressure of fluoroplastic, but also solved the Steel material is not resistant to corrosion problems.
Lined fluorine valve, also known as fluoroplastic lining corrosion valve, PTFE resin (or profile processed) using molded (or inlaid) method placed on the inner wall of the steel or iron valve pressure parts (the same method Suitable for all kinds of pressure vessels and pipe fittings lining) or the inner surface of the valve internals, the use of its unique properties in the anti-corrosive medium made of various types of valves and pressure vessels.
Lined fluorine valve is the body of the media can reach all the lining process, the lining material generally FEP (F46) and PCTFE (F3) and other fluoroplastics, can be applied to a variety of concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid , Aqua regia and a variety of organic acids, strong acids, strong oxidants and other corrosive media and other pipelines, but the temperature of the fluorine-containing valve is relatively large (only applicable to the medium between -50 ℃ ~ 150 ℃) Valve made of fluorine plastic lined with: butterfly valve, ball valve, globe valve, diaphragm valve, gate valve, plug valve, check valve, control valve, tank discharge valve.
Fluoroplastic-lined valves have excellent heat and cold resistance, excellent electrical insulation and excellent chemical stability, and are resistant to all types of strong acids, strong bases and strong oxidizers. Their low friction and self-lubricity are very good .
Fluorine plastic lining valves for temperature according to the choice of different materials (metal materials and non-metallic materials) can withstand the temperature comprehensive assessment. Such as steel lined fluorine plastic (WCB + F46) material, the use of temperature - 29 ~ 150 ℃. Limit the maximum value does not exceed 150 ℃. Suitable medium for low viscosity acids and bases and other corrosive media, mainly refers to acidic, alkaline, organic and inorganic solvents and other corrosive media. Low viscosity is relatively high concentration of granular media, the fluorine plastic liner valves should try to avoid the use of solid particulate media.
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