Flange Gasket
A gasket is a ring made of a material that can produce plastic deformation and has a certain strength. Most of the gaskets are cut from non-metallic sheets, or made by professional factories according to the specified size, and their materials are asbestos rubber sheets, asbestos sheets, PTFE sheets, polyethylene sheets, etc.; there are also thin metal sheets (white iron sheets, Stainless steel) is a metal-clad gasket made by wrapping non-metallic materials such as asbestos; there is also a wound gasket made of thin steel strip and asbestos strip, commonly used is stainless steel strip and graphite. For metal spiral wound gaskets, asbestos can also be used for spiral wound tapes depending on the use environment. Ordinary rubber gaskets are suitable for occasions where the temperature is lower than 120 °C; asbestos rubber gaskets are suitable for occasions where the temperature of water vapor is lower than 450 °C, the temperature of oil is lower than 350 °C, and the pressure is lower than 5MPa. The medium, commonly used is acid-resistant asbestos board. In high-pressure equipment and pipelines, lens-type or other-shaped metal gaskets made of copper, aluminum, 10-gauge 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 high.
The low-pressure small diameter has a wire flange, and the high-pressure and low-pressure large diameter use welded flanges. The thickness of the flanges and the diameter and number of connecting bolts are different for different pressures.
