Introduction to the classification, application and use of fluorine-lined valves

by:Lianke Valve     2022-08-30
Fluorine-lined valve, also known as fluoroplastic lined corrosion-resistant valve, is a method of placing polytetrafluoroethylene resin (or profile processed) on the inner wall of a steel or iron valve pressure-bearing part (same method) by molding (or inlaying) It is suitable for the lining of various pressure vessels and pipeline accessories) or the outer surface of valve internals, and is made into various valves and pressure vessels by using its unique performance in resisting strong corrosive media. Fluorine lined valve classification Fluorine lined valve is divided into pipe pinch valve, lined diaphragm valve, lined pneumatic butterfly valve lined ball valve, lined check valve, lined fluorine globe valve, lined plug valve, lined wedge gate valve, diaphragm valve, butterfly valve, ball valve, rotary valve Open type, ball core check valve, pneumatic rubber-lined, fluorine-lined plastic diaphragm valve (normally closed), DC rubber-lined diaphragm valve, packing type adjustable fluorine-lined plastic butterfly valve, fluorine-lined plastic globe valve, etc. The application and use of fluorine-lined valves 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 project has attracted great attention and favor from various engineering design units and construction units, and is a sunrise product with market potential. The fluorine-lined valve has dual functions of switching and flow adjustment, which can easily open and close the gas circuit without affecting the flow, ensuring the repeatability of the flow. The opening is slow, reducing the impact force of the instantaneous pipeline pressure on the instrument. A damper is quite added, which greatly prolongs the service life of the fluorine-lined valve. Fluorine-lined valves are 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 and various alkalis 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 it to close again 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 medium, measures should be taken to ensure that the ambient temperature and working condition temperature cannot exceed the spontaneous combustion point of the medium to prevent the danger caused by sunlight or external fire. 8. For the severe 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 crystallization of the medium and solid particles due to its soft texture, resulting in sealing leakage. Repair or replace the seal in time after discovery. 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 work according to the operating procedures. To avoid accidents during disassembly,Prevent accidents from happening. The fluorine-lined valve adopts the lining process for all the places where the medium in the valve body can reach. The lining material is generally made of fluoroplastics such as FEP (F46) and PCTFE (F3). Aqua regia and various organic acids, strong acids of rotor pumps, strong oxidants and other corrosive media pipelines, but fluorine-lined valves are relatively limited by temperature (only suitable for media between -50°C and 150°C). Valves that can be lined with fluorine plastics include: fluorine lined butterfly valve, fluorine lined ball valve, fluorine lined globe valve, fluorine lined diaphragm valve, fluorine lined gate valve, fluorine lined plug valve, etc.
Maintaining types of industrial valves is not as easy as it may seem. You have to do plenty of important tasks. So cruel is the truth unless you've got a to help you.
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