China Lined Valve Manufacturers & Suppliers

What is the Lined Valve using for?

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With the rapid development of modern industry, fluorine-lined valves and their various pipeline accessories have been rapidly applied and promoted in various fields such as petroleum, printing and dyeing, and chemical industry, showing strong vitality. The design unit and the construction unit have paid great attention and favor, and it is a sunrise product with great market potential.

The fluorine-lined valve has dual functions of switch and flow adjustment, which can easily open and close the gas circuit without affecting the flow, ensuring the repeatability of the flow. It starts slowly, reducing the impact of instantaneous pipeline pressure on the instrument. Quite a damper is added, which greatly increases the service life of the needle valve. Fluorine-lined valves are specially used to control corrosive or strong corrosive media. The surface of the valve body cavity is covered with various fluoroplastics, which are suitable for different working temperatures and fluid pipelines, and have the characteristics of high strength and good corrosion resistance.​​

The price of fluorine-lined valves is relatively high, and the working conditions are harsh. They are either toxic and harmful chemicals, or are highly corrosive. Various types of acids and bases or organic solvents. Improper use will cause major economic losses and serious consequences. Correct use and maintenance of the valve can prolong the service life of the fluorine-lined valve, prevent the occurrence of various accidents, and ensure the normal operation of the pipeline. 

Therefore, the following points must be paid attention to in use:
1. Before use, read the product instruction manual carefully.​​

2. Use it within the range of pressure, temperature and medium specified on the nameplate or in the manual.​​

3. When in use, 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 the lever to open and close the fluorine-lined valve. Pay attention to observe the opening and closing indication position and limit device of the fluorine-lined valve. After the opening and closing are in place, do not force the closure to avoid premature damage to the fluorine plastic sealing surface.​​

5. For some media that are unstable and easy to decompose (for example, the decomposition of some media will cause volume expansion and cause abnormal pressure increase in working conditions), which may cause valve damage or leakage, measures should be taken to eliminate or limit the factors that cause the decomposition of unstable media. . When selecting the valve, the fluorine-lined valve with an automatic pressure relief device should be selected in consideration of the possible changes in the working conditions caused by the unstable and easy decomposition of the medium.​​

6. For the fluorine-lined valve on the pipeline with toxic, flammable, explosive and strong corrosive medium, it is strictly forbidden to replace the packing under pressure. Although the fluorine-lined valve is designed to have an upper sealing function, it is not recommended to replace the packing under pressure.​​

7. For pipelines with spontaneous combustion media, measures should be taken to ensure that the ambient temperature and the temperature of the working conditions cannot exceed the spontaneous ignition point of the media to prevent dangers caused by sunlight or external fires.​​

8. For the violent and long-term vibration of the pipeline, measures should be taken to eliminate it to avoid damage to the fluoroplastic lined valve.​​

9. During the use of the fluorine-lined valve, the fluoroplastic sealing surface is often damaged due to medium crystallization and solid particles 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 to adjust the flow during use. The high-speed medium causes premature damage to the sealing surface. In this case, the seals should be replaced in time.​​

11. Gaskets are generally not added to the flanges of fluorine-lined valves. In case of leakage at the middle flange, tighten the nuts of the middle flange evenly to eliminate leakage. If the sealing surface of the middle flange is damaged, it is necessary to repair the sealing surface and add the middle flange gasket to solve it.​​

12. If the handle or handwheel is inflexible or unable to open and close the fluorine-lined valve, loosen the gland nut appropriately. Still inflexible to turn. It may be that the gland is skewed, and the gland should be adjusted. After adjusting and loosening the gland, the fluorine-lined valve cannot be opened and closed flexibly. It should be disassembled and inspected to remove dirt and troubleshoot. When disassembling this type of fluorine-lined valve, you should pay attention to what medium is in the pipeline of the fluorine-lined valve, whether it is used or newly installed. If the medium used is toxic, flammable, and explosive substances, the staff should wear protective masks and rubber gloves, and wear protective clothing to operate in accordance with the operating procedures. Avoid accidents during disassembly and prevent accidents from happening.


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