fluorine lining gate valve

Talking about the advantages and disadvantages of fluorine-lined butterfly valve

by:Lianke Valve     2022-08-07
Fluorine-lined butterfly valves are widely used in the transportation of liquids and gases (including steam) in various types of industrial pipelines, especially in the use of severely corrosive media, such as: sulfuric acid, hydrofluoric acid, phosphoric acid, chlorine, strong alkali, king Water and other highly corrosive media have the advantages of compact structure, beautiful appearance, reasonable process and reliable performance. Advantages and disadvantages of fluorine-lined butterfly valve: 1. Advantages of fluorine-lined butterfly valve: 1. Due to the limitation of structural characteristics, fluorine-lined butterfly valve is not suitable for industries such as high temperature resistance, high pressure, corrosion resistance and wear resistance. As a component used to realize the on-off and flow control of the pipeline system, the rubber-lined butterfly valve has been widely used in many fields such as petroleum, chemical industry, metallurgy, hydropower and so on. 2. The butterfly plate of the fluorine-lined butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully open. 3. For triple eccentric metal hard sealing butterfly valve, the valve body and valve seat are conjoined components, and the sealing surface layer of the valve seat is surfacing with temperature-resistant and corrosion-resistant alloy materials. The multi-layer soft stacked sealing ring is fixed on the valve plate. Compared with the traditional butterfly valve, this butterfly valve has high temperature resistance, easy operation, and no friction when opening and closing. When closing, the torque of the transmission mechanism increases to compensate the sealing, which improves the butterfly valve. The advantages of excellent sealing performance and extended service life. 2. Disadvantages in the use of fluorine-lined butterfly valves: 1. Since the multi-layer soft and hard laminated sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scour on its sealing surface, and the soft seal in the metal sheet interlayer After the belt is washed, it directly affects the sealing performance. 2. Due to the principle of the rubber-lined butterfly valve, the sealing between the sealing surface of the valve plate and the valve seat relies on the torque of the transmission device to press the valve plate to the valve seat. In the positive flow state, the higher the medium pressure, the tighter the seal squeezes. When the medium in the flow channel flows back, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure as the medium pressure increases, and the seal begins to leak. 3. Restricted by structural conditions, the structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.
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