Flange, also known as a flange disc or rim. A flange is a component that connects shafts together, used for joining pipe ends; there are also flanges used at equipment inlets and outlets for connecting two devices, such as a reducer flange. Flange connection or flange joint refers to a detachable joint formed by the combination of flanges, gaskets, and bolts. Pipe flanges are the flanges used for piping in pipeline installations; when used on equipment, they refer to the equipment's inlet and outlet flanges. Flanges have holes, and bolts are used to tightly secure the two flanges. Flanges are sealed with a gasket. Flanges are categorized into threaded (screwed) flanges,焊接 flanges, and clamp flanges. Flanges are used in pairs; low-pressure pipelines can use threaded flanges, while those above 4 kg of pressure use焊接 flanges. A sealing gasket is placed between the two flange disks, and then bolts are tightened. Flanges of different pressures have different thicknesses, and they use different bolts. When pumps and valves are connected to pipes, the local parts of these equipment are also made into corresponding flange shapes, also known as flange connections. Any connection part that uses bolts to connect two flat surfaces around the periphery and is sealed simultaneously is generally called a "flange," such as the connection of ventilation pipes, these types of parts can be called "flange-type components." However, such connections are only a part of a device, like the connection between a flange and a pump, so it's not appropriate to call the pump a "flange-type component." Smaller components like valves can be referred to as "flange-type components."