What is the material of fluorine lining valve

The material of fluorine lining valve is PTFE.

Fluorine lined valves, also known as fluorine plastic lined corrosion resistant valves, is a PTFE resin molded or inlaid on the inner wall of the steel or iron valve pressure parts (the same method applies to all types of pressure vessels and piping accessories lining) or the outer surface of the valve inner parts, the use of its unique properties in the resistance to strong corrosive media produced into various types of valves and pressure vessels.

Polytetrafluoroethylene, commonly known as the plastic king, was first developed by U.S. DUPONT CO., LTD in 1938 and industrial production began in 1949. From an industrial application perspective, it has a history of 50 years and is becoming widely used in the valve industry. Fluorine lined valves are lined with a lining process for all areas where the medium can reach in the valve body. The lining material generally consists of fluorine plastics such as FEP (F46) and PCTFE (F3), which can be used in pipelines with various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, all kinds of organic acids, strong acids, strong oxidizers, and other corrosive media. However, fluorine lined valves have a temperature limitation (only suitable for media between -50℃~150℃). The types of valves that can be made with fluorine plastic lining include fluorine lined butterfly valves, fluorine lined ball valves, fluorine lined globe valves, fluorine lined diaphragm valves, fluorine lined gate valves, fluorine lined plug valves, and more.

With the rapid development of modern industry, fluorine lined valves and its various types of piping accessories in the petroleum, printing and dyeing, chemical and other fields have been rapidly applied to the promotion of the project as the preferred project has aroused the great concern and favor of the engineering design units and construction units, is a kind of sunrise products with great market potential.

Fluorine lined valve is a dual function of switching and flow regulation, can easily switch the gas line without affecting the flow, to ensure the repeatability of the flow. Slow opening reduces the instantaneous pipeline pressure, which is equivalent to adding a damper, thus greatly extending the service life of fluorine lined valves. Fluorine lined valves are specially used for controlling corrosive or strongly corrosive media, the surface of the inner cavity of the valve body is covered with various kinds of fluorine plastics that can be selected, which is suitable for different working temperatures and fluid pipelines, and is characterized by high strength and good corrosion resistance.

Fluorine lined valves are more expensive, located in harsh working conditions, either toxic and harmful chemicals, or very corrosive types of acids and alkalis or organic solvents, improper use will produce significant economic losses and serious consequences. Correct use and maintenance of the valve can extend the service life of fluorine lined valves, to prevent the occurrence of various types of accidents, to ensure the normal operation of the pipeline. Therefore, the use of the following points must be noted:

Carefully read the product instructions before use.

Pressure, temperature, and media range according to the nameplate or instructions.

The use of fluorine lined valves to prevent excessive pipeline stress due to temperature changes, try to minimize temperature changes, and increase the U-type expansion joints before and after the valve.

Do not use levers to open and close the fluorine lined valves. Pay attention to the instructions for opening and closing the fluorine lined valves. Open and close gently, do not force the closure to prevent premature damage to the fluorine plastic sealing surface.

For some media that are unstable and prone to decomposition (such as media decomposition leading to abnormal pressure increase), it can cause valve damage or leakage. Measures should be taken to eliminate or limit the factors that cause the decomposition of unstable media. When selecting valves, consideration should be given to the potential changes in working conditions due to the unstable decomposition of the medium, and valves with automatic pressure relief devices and fluorine lining should be chosen.

For toxic, flammable, explosive, highly corrosive media pipeline fluorine lined valves, it is strictly prohibited to replace the packing under pressure. Although fluorine lined valves in the design of the sealing function, but also do not recommend the replacement of packing under pressure.

For pipelines with media prone to spontaneous combustion, measures should be taken to ensure that the ambient temperature and working temperature do not exceed the medium's spontaneous combustion point to prevent the risk of ignition from sunlight or external fire.

For pipeline vibration and long-term, take measures to eliminate to avoid resulting damage to the fluorine plastic lined valve.

During the use of 9 fluorine-lined valves, the soft texture of the fluorine plastic sealing surface often leads to damage caused by solid particles from media crystallization, resulting in seal leakage. It is important to promptly identify and refurbish or replace the seals when such issues are found.

In use, some fluorine-lined valves are damaged prematurely due to high-speed media during flow rate adjustment. When encountering this situation, replace the seals promptly.

11, fluorine lined valves in the flange generally do not add gaskets. If leakage is encountered at the center flange, the center flange nut can be tightened evenly to eliminate leakage. If the sealing surface of the center flange is damaged, repair the sealing surface and add the center flange gasket to solve the problem.

If the handle or handwheel rotation is not flexible or cannot open and close the fluorine lined valve, appropriate to loosen the gland nut, the rotation is still not flexible may be skewed gland, to adjust the gland. After adjusting and loosening the gland cannot be flexible to open and close the fluorine lined valves, should be disassembled to check, remove dirt, troubleshooting. When disassembling this type of fluorine lined valve, should pay attention to the fluorine lined valve pipeline is what medium, is used, or newly installed. If the medium used is toxic, flammable, explosive substances, the staff should wear protective masks and gloves, wear protective clothing in accordance with the operating procedures. Avoid accidents during dismantling and eliminate accidents.