Flange Gasket

Gasket is a ring made of a material that can produce plastic deformation and has a certain strength. Most gaskets are cut from non-metallic plates or made by professional factories according to specified sizes. The materials are asbestos rubber sheets, asbestos sheets, PTFE sheets, polyethylene sheets, etc. There are also metal-clad gaskets made by wrapping non-metallic materials such as asbestos with thin metal sheets (tinplate, stainless steel); there is also a wound gasket made of thin steel strips and asbestos strips. The most commonly used is a metal wound gasket made of stainless steel strips and graphite. Depending on the use environment, the winding tape can also be made of asbestos. Ordinary rubber gaskets are suitable for occasions with temperatures below 120°C; asbestos rubber gaskets are suitable for water vapor temperatures below 450°C, oil temperatures below 350°C, and pressures below 5MPa. For general corrosive media, the most commonly used is acid-resistant asbestos sheets. In high-pressure equipment and pipelines, lens-shaped or other shaped metal gaskets made of copper, aluminum, No. 10 steel, and stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the processing finish of the sealing surface and the gasket is relatively high.
Low-pressure small-diameter flanges have threaded flanges, and high-pressure and low-pressure large-diameter flanges use welded flanges. The thickness of flanges of different pressures and the diameter and number of connecting bolts are different.