Flanges, also known as flange discs or flanges. A flange is a component that connects shafts to each other and is used for connecting pipe ends; Also used for flanges on equipment imports and exports, used for connecting two devices, such as gearbox flanges. Flange connection or flange joint refers to a detachable connection in which a flange, gasket, and bolt are connected to each other as a combined sealing structure. Pipeline flange refers to the flange used for piping in pipeline installations, and when used on equipment, it refers to the inlet and outlet flanges of the equipment. There are holes on the flange, and bolts tightly connect the two flanges. Seal the flanges with gaskets. Flanges are divided into threaded connections (threaded connections), welded flanges, and clamp flanges. Flanges are used in pairs. For low-pressure pipelines, threaded flanges can be used, while for pressures above four kilograms, welded flanges can be used.