Flange is a component that connects pipes to each other and is used for connecting pipe ends; It is also used as a flange on the inlet and outlet of the equipment for the connection between two devices. Flange connection or flange joint refers to a detachable connection consisting of flanges, gaskets, and bolts connected to each other as a combination sealing structure. Pipeline flange refers to the flange used for piping in pipeline devices, and when used on equipment, it refers to the inlet and outlet flanges of the equipment. There are holes on the flange, and bolts make the two flanges tightly connected. Seal the flanges with gaskets. The flange is divided into threaded connection (threaded connection) flange , blind flange, raised flange and welded flange etc. Add a sealing gasket between the two flange plates and tighten them with bolts. The thickness of flanges under different pressures varies, and the bolts used are also different.