Flange gasket

Rubber flange gasket
The gasket is a ring made of material that can produce plastic deformation and has certain strength. Most gaskets are cut from non-metallic plates or made by professional factories according to the specified size. The materials are asbestos rubber plate, asbestos plate, tetrafluoroethylene plate, polyethylene plate, etc; It is also a metal-clad gasket made by wrapping asbestos and other non-metallic materials with thin metal plates (white iron sheet, stainless steel); There is also a spiral wound gasket made of thin steel tape and asbestos tape. The most commonly used is the metal spiral wound gasket made of stainless steel tape and graphite. According to the different use environment, asbestos can also be used for the spiral wound gasket. Ordinary rubber gasket is suitable for occasions with temperature lower than 120 ℃; Asbestos rubber gasket is suitable for occasions where the water vapor temperature is lower than 450 ℃, the oil temperature is lower than 350 ℃, and the pressure is lower than 5MPa. For general corrosive media, acid-resistant asbestos plate is the most commonly used. In high-pressure equipment and pipelines, lens type or other 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 machining finish between the sealing surface and gasket is high.
Low pressure small diameter has threaded flange, high pressure and low pressure large diameter use welded flange, the thickness of flange plate and the diameter and quantity of connecting bolts are different under different pressures