The standard specification, size, pressure type and sealing surface of the flange shall be clearly stated in the flange inquiry. These are the most basic common sense signs of flanges. Shanxi Haokun flange Group Co., Ltd. popularizes the knowledge of flange sealing surface for everyone. The sealing surface of flange is generally divided into three types: plane sealing surface, concave convex sealing surface and tenon groove sealing surface. The flange with flat sealing surface is generally used for low pressure and non-toxic medium transportation; The flange with concave convex sealing surface can be used on higher pressure; Tenon flanges are generally used when flammable, explosive, toxic media and high pressure. In addition to the sealing surface of the flange itself, the flange is also sealed with gaskets in the middle,
After tightening the nut, the surface specific pressure of the gasket in the middle will rise and deform. Fill the uneven place to form the whole sealing device, and the connection is tight without leakage. Gaskets are generally made of copper, aluminum, No. 10 steel, stainless steel lens type or other metal shapes in high-pressure equipment and pipelines. There are very few connection points between the high-pressure gasket and the flange sealing surface, which is generally a line. Such a surface has low roughness and looks flat and clean. If the ambient temperature of the flange is relatively low, it is generally OK to use ordinary non-metal. Asbestos rubber gasket is generally used when the flange is in a high environment (< = 450 °) and the pressure is lower than 5 MPa. For flanges used in general corrosive media, the most commonly used is acid resistant asbestos plate.
