Flange, also known as Flange Flange plate or Flange. Flange is the shaft and shaft connected parts, used for the connection between the pipe end; Also useful in equipment inlet and outlet flange, used for the connection between two equipment, such as reducer flange. Flange connection or flange joint refers to a detachable connection made of flange, gasket and bolt which are connected to each other as a group of assembled sealing structures. Pipeline flanges refer to the flanges for piping in pipeline devices and the import and export flanges of equipment when used in equipment. There are holes in the flange and bolts hold the two flanges together. Gasket seals between flanges. Flange threaded connection (threaded connection) flanges, welding flanges and clip flanges. Flanges are used in pairs, threaded flanges can be used for low pressure pipes, welded flanges are used for pressures above 4 kg. Put a gasket between the two flannels and bolt them down. Flanges at different pressures have different thicknesses, and they 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 the two planes around 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".