Large flanges have different use values ​​in the process of use, with different types of production efficiency and use. Different flange materials have different production and processing processes. Therefore, special attention should be paid to the use and processing of large flanges. They should be used according to certain procedures and methods.

Large flanges commonly found in large flanges are flat welded large flanges and butt welded large flanges. Flat welding large flanges have poor rigidity, and the applicable range is the occasion of pressure p≤4MPa; butt welding large flanges, also known as high-neck large flanges, are relatively rigid and suitable for occasions with high pressure and temperature. There are three types of large flange sealing surfaces: flat sealing surface, suitable for occasions where pressure is not high and medium is non-toxic; concave and convex sealing surface is suitable for occasions with higher pressure; groove sealing surface is suitable for flammable and easy Explosive, toxic media and high pressure occasions. Large-scale flanged pipe fittings of different properties have good product performance in different fields, and the effects and environments are different, and the effects will be different.

A large flange gasket is a ring made of a material that is plastically deformed and has a certain strength. Most of the gaskets are cut from non-metal plates or made by professional factories according to the specified size. The materials are asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc.; asbestos is also used for thin metal sheets (white iron, stainless steel). A metal-clad gasket made of a non-metallic material; and a wound gasket wound with a thin steel strip and an asbestos tape.

Large flanges are used in high-voltage equipment and pipes, and are made of copper, aluminum, 10 gauge steel, stainless steel lens or other shapes of metal gaskets. The contact width of the high-pressure gasket of the large flange and the sealing surface is very narrow (line contact), and the sealing surface and the gasket have a high processing finish.

Large flange connections are mainly used for the connection of cast iron pipes, rubber-lined pipes, non-ferrous metal pipes and large flange valves. The connection between process equipment and large flanges is also connected by large flanges.

The main features of the large flange connection are easy disassembly, high strength and good sealing performance. When installing a large flange, two large flanges are required to be parallel, and the sealing surface of the large flange cannot be scratched and cleaned. The gaskets used for large flanges shall be selected according to the design regulations.

Large flange connections are an important connection for pipeline construction.

Large flanges are threaded (wired) large flanges and welded large flanges. Low-pressure small-diameter wire-bonded large flanges, high-pressure and low-pressure large diameters are all welded large flanges. The thickness of large flanges with different pressures and the diameter and number of connecting bolts are different. According to different grades of pressure, large-scale method Blue mats also come in a variety of materials, from low-pressure asbestos mats, high-pressure asbestos mats to metal mats.