In the production process of fluorine-lined butterfly valve
, in addition to processing and molding technology, factors such as raw material supply, production cost and environmental impact should also be considered, so the production of fluorine-lined butterfly valve is a complex and heavy process. The fluorine-lined butterfly valve appeared with the emergence of fluorine plastics and the needs of society. It is the product of the development stage of modern science and technology. Compared with ordinary valves, the fluorine-lined butterfly valve has its own uniqueness in material selection and manufacturing process. The place. Compression molding is one of the most ideal molding processes in the application of fluorine-lined butterfly valves. It is to put a certain amount of fluoroplastics (powder, granular, fibrous, flake and chip, etc.) into the molding cavity, and then It is closed, heated to a certain temperature in a heating furnace, and melted and flowed under the action of pressure, slowly filling the entire cavity to obtain the shape given by the cavity. As the degree of chemical reaction of fluoroplastics increases, the melt gradually loses its fluidity and becomes an infusible body structure and becomes a solid. After cooling to a certain temperature, the mold is opened to become a finished product, thereby completing the molding process. The structural length of the fluorine-lined butterfly valve and the dimensions of both ends of the flange are implemented in accordance with the relevant standards and industry standards for steel valves. If the structural length is in accordance with the GB/T12221 standard, the structural length includes the thickness of the flange sealing surface lined with fluoroplastics. Flange connection dimensions are in accordance with the provisions of GB/T 9113.1. And limited to flange end connection, welding method is not allowed to connect. It is convenient for the installation and connection of industrial pipelines without affecting the product quality due to welding. The determination of the thickness of the lining layer is not only a scientific problem, but also a more realistic economic problem. The thickness of the fluorine lining layer wastes expensive fluoroplastics, and the thin lining cannot meet the requirements of use, because the fluoroplastics are polymer materials, which can absorb a small amount of contact with it. The characteristics of the gas, with the increase of temperature, the volume of the material expands, the gap between the molecules increases, and the penetration and absorption intensifies. Only by increasing the thickness properly can the penetration be reduced. Therefore, in the design of the lining layer, increasing the thickness is used to make up for this defect. After testing, it is determined that the thickness of the lining layer δ≥2mm is more appropriate, and it increases with the increase of the valve diameter. The performance of the fluorine-lined butterfly valve is more advantageous than the valve of the same function type in many aspects. Now, the application of fluorine-lined butterfly valve in the industry has become more and more extensive. We have reason to believe that in the future, its development will be very good, and it will become the darling of the market.
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