Purpose And Use Of Fluorine-lined Valves

With the rapid development of modern industry, Lined Valve and its various pipeline accessories have been rapidly applied and promoted in various fields such as petroleum, printing and dyeing, and chemical industry, showing strong vitality. As the preferred project in the project, it has attracted great attention and favor from various engineering design units and construction units. It is a sunrise product with great market potential.
Fluorine-lined valves have the dual functions of switching and flow regulation. They can conveniently open and close the gas line without affecting the flow, ensuring the repeatability of the flow. Slow opening reduces the impact of instantaneous pipeline pressure on the instrument. It is equivalent to adding a damper, which greatly extends the service life of the fluorine-lined valve. Fluorine-lined valves are specially used to control corrosive or highly corrosive media. The inner surface of the valve body is covered with various fluoroplastics that can be selected. It is suitable for different working temperatures and fluid pipelines, and has the characteristics of high strength and good corrosion resistance.
Fluorine-lined valves are relatively expensive, and the working environment they are in is harsh. They are either toxic and harmful chemicals, or highly corrosive acids, alkalis or organic solvents. Improper use will result in significant economic losses and serious consequences. Correct use and maintenance of valves can extend the service life of fluorine-lined valves, prevent all kinds of accidents, and ensure the normal operation of pipelines. Therefore, the following points must be noted during use:
1. Before use, carefully read the product manual.
2. Use within the range of pressure, temperature, and medium specified on the nameplate or manual.
3. When using, prevent the fluorine-lined valve from generating excessive pipeline stress due to temperature changes, minimize temperature changes, and add U-shaped expansion joints before and after the valve.
4. It is forbidden to use a lever to open and close the fluorine-lined valve. Pay attention to the opening and closing indication position and limit device of the fluorine-lined valve. After opening and closing, do not force it to close to avoid premature damage to the fluorine plastic sealing surface.
5. For some unstable and easy-to-decompose media (such as the decomposition of some media will cause volume expansion and cause abnormal increase in working pressure), which will 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, the changes in working conditions that may be caused by the instability and easy decomposition of the medium should be considered and a fluorine-lined valve with an automatic pressure relief device should be selected.
6. For fluorine-lined valves on pipelines with toxic, flammable, explosive, and highly corrosive media, it is strictly forbidden to replace the packing under pressure. Although fluorine-lined valves are designed with sealing functions, it is not recommended to replace the packing under pressure.
7. For pipelines with self-ignitable media, measures should be taken to ensure that the ambient temperature and operating temperature do not exceed the self-ignition point of the medium to prevent dangers caused by sunlight or external fire.
8. For severe and long-term vibrations of pipelines, measures should be taken to eliminate them to avoid damage to fluoroplastic lined valves.
9. During the use of fluorine-lined valves, the fluoroplastic sealing surface is often damaged by crystallization and solid particles of the medium due to its soft texture, resulting in sealing leakage. After discovery, repair or replace the seal in time.
10. Some fluorine-lined valves are partially opened during use to adjust the flow rate. High-speed media causes premature damage to the sealing surface. In this case, replace the seal in time.
11. Gaskets are generally not added to the middle flange of fluorine-lined valves. If leakage occurs at the middle flange, the middle flange nuts can be tightened evenly to eliminate the leakage. If the sealing surface of the middle flange is damaged, the sealing surface should be repaired and the middle flange gasket should be added to solve the problem.
12. If the handle or handwheel is not flexible or cannot open and close the fluorine-lined valve, the gland nut can be loosened appropriately. The rotation is still not flexible. The gland may be skewed and the gland should be adjusted. After adjustment and loosening the gland, the fluorine-lined valve cannot be opened and closed flexibly. It should be disassembled for inspection, dirt should be removed, and faults should be eliminated. When disassembling this type of fluorine-lined valve, pay attention to what medium is in the fluorine-lined valve pipeline, whether it is used or newly installed. If the medium used is toxic, flammable, or explosive, the staff should wear protective masks and rubber gloves, wear protective clothing, and operate in accordance with the operating procedures. Avoid accidents during disassembly and prevent accidents from happening.