In pipeline engineering, flange is mainly used for pipeline connection.In the pipeline that needs to be connected, all kinds of installation of a flange, low-pressure pipeline can use wire flange, more than 4 kg of pressure using welding flange.Add a sealing point between the two flannels and bolt them tight.Flanges with different pressures have different thicknesses and use different bolts.Pumps and valves, when connected to pipes, are also made into the corresponding flange shape, also known as flange connection.

All in two planes in the periphery of the use of bolt connection at the same time closed connection parts, generally known as "flange", such as ventilation pipe connection, this kind of parts can be called "flange parts".But this connection is only a part of the equipment, such as flange and water pump connection, it is not good to call the pump "flange parts".Smaller ones, such as valves, can be called "flange parts".