Flange, also known as flange or flange. It is the part that connects the pipe to the pipe. Connect to tube end. There are holes on the flange, bolt can be worn to make the two flanges tight. Gasket seals between flanges. Flanged fittings refer to fittings with flanges (flanges or joints). It may be cast, threaded or welded. Flange (joint) consists of a pair of flanges, a gasket and several bolts and nuts. The gasket is placed between the sealing faces of two flanges. After tightening the nut, the specific pressure on the gasket surface reaches a certain value, resulting in deformation, and filling the uneven sealing surface, so that the connection is tight and does not leak. Some pipe fittings and equipment have already come with flange, also belong to flange connection. Flange connection is an important way of pipeline construction.