What is the material of fluorine lining valve

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 is commonly known as the plastic king, by the U.S. DUPONT CO., LTD in 1938, first developed in 1949, industrial production, from the industrial application point of view has a history of 50 years, and will be widely used in the valve industry is not long. Fluorine lined valves are lined with lining process for all the places where the medium can reach in the valve body, and the lining material generally adopts fluorine plastics such as FEP (F46) and PCTFE (F3), which can be applied to pipelines with various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia and all kinds of organic acids, strong acids, strong oxidizers and other corrosive mediums, etc. However, the fluorine lined valves are subject to the limitation of the temperature (only for mediums between -50℃~150℃), but the lined valves have the limitation of temperature (only for mediums between -50℃~150℃). However, the temperature limitation of fluorine lined valves is relatively large (only applicable to the medium between -50℃~150℃), and the valves that can be made of fluorine plastic lining are: fluorine lined butterfly valve, fluorine lined ball valve, fluorine lined globe valve, fluorine lined diaphragm valve, fluorine lined gate valve, fluorine lined plug valve and so on.

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:

1, carefully read the product instructions before use.

2, according to the nameplate or instructions on the pressure, temperature, the use of media range.

3, 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.

4, prohibit the use of levers to open and close the fluorine lined valves, pay attention to the fluorine lined valves open and close the position of the instructions, open and close in place, do not force the closure, to avoid premature damage to the fluorine plastic sealing surface.

5, for some media is unstable and easy to decompose (such as the decomposition of some media will cause volume expansion resulting in abnormal pressure rise) will cause damage to the valve or leakage, measures should be taken to eliminate or limit the factors that cause the decomposition of unstable media. In the valve selection, should take into account the unstable decomposition of the medium may cause changes in working conditions and choose to have automatic pressure relief device fluorine lined valves.

6, 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.

7, for the pipeline with spontaneous combustion media, to take measures to ensure that the ambient temperature and working temperature shall not exceed the spontaneous combustion point of the medium, to prevent the danger of sunlight or external fire occurs.

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

9, fluorine lined valves in the process of use, fluorine plastic sealing surface due to the soft texture, often due to media crystallization, solid particles will be sealing surface damage, resulting in seal leakage, found in a timely manner after the refurbishment or replacement of seals.

10, some fluorine lined valves in use as part of the opening of the flow rate adjustment, high-speed media leading to premature damage to the sealing surface, encountered this situation, to replace the seals in a timely manner.

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.

12, if the handle or handwheel rotation is not flexible or can not open and close the fluorine lined valve, can be 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 can not 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.