Fluoroplastic lined corrosion-resistant butterfly valve is to place polytetrafluoroethylene resin (or profile processed) on the inner wall of steel or iron butterfly valve pressure-bearing parts or the outer surface of butterfly valve inner parts by molding (or inlay) method. The unique properties of butterfly valves against strong corrosive media are made into various types of butterfly valves and pressure vessels.
In anti-corrosion materials, PTFE has unparalleled excellent performance. In addition to molten metal, elemental fluorine and aromatic hydrocarbons, it can be used in various concentrations of hydrochloric acid, sulfuric acid, nitric acid, aqua regia, organic acid, strong oxidant, concentrated , alternating dilute acid, alternating alkali and various organic agents are random reactions. Lining PTFE on the inner wall of butterfly valve not only overcomes the shortcomings of low strength of PTFE material, but also solves the problem of corrosion resistance of butterfly valve theme materials. Poor performance and high cost. In addition, in addition to its excellent chemical stability, PTFE has good antifouling and anti-stick properties, extremely small dynamic and static friction coefficients, and good anti-friction and lubrication performance. It is used as the sealing pair for opening and closing of butterfly valves, and it is necessary to reduce the sealing surface. The friction between the butterfly valves can be reduced, the operating torque of the butterfly valve can be reduced, and the service life of the product can be improved.
Fluorine-lined butterfly valve, also known as anti-corrosion butterfly valve, is often used in harsh working conditions, either toxic and harmful chemicals, or highly corrosive various types of acid-base or organic solvents. Improper use will result in significant economic losses and serious as a result of. Correct use and maintenance of the butterfly valve can prolong the service life of the fluorine-lined butterfly valve, so what details can be done to effectively protect it?
1. Before use, carefully read the instruction manual of the fluorine-lined butterfly valve.
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 butterfly valve from generating excessive pipeline stress due to temperature changes, minimize temperature changes, and add U-shaped expansion joints before and after the butterfly valve.
4. It is forbidden to use the lever to open and close the fluorine-lined butterfly valve. Pay attention to observe the opening and closing indication position and limit device of the fluorine-lined butterfly valve. After the opening and closing are in place, do not force the valve to close, 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 will cause butterfly valve damage or leakage, measures should be taken to eliminate or limit the factors that cause the decomposition of unstable media. . When selecting a butterfly valve, the fluorine-lined butterfly valve with an automatic pressure relief device should be selected in consideration of the possible changes in working conditions caused by the unstable and easy decomposition of the medium.
6. For the fluorine-lined butterfly 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 butterfly valve has an upper sealing function in design, 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.
Applicable medium: various concentrations of acid-base salts and some organic solvents.
Post time: Nov-08-2022
