Flange, also known as a flange disk or raised rim. A flange is a component that connects shafts together, used for connecting pipe ends; there are also flanges used on equipment进出口 for connecting two pieces of equipment, such as reducer flanges. Flange connection or flange joint refers to the detachable connection formed by the combination of flanges, gaskets, and bolts. Pipe flanges refer to the flanges used for piping in pipe systems, or to the进出口 flanges on equipment. Flanges have holes, and bolts are used to tightly secure the two flanges. They are sealed with a gasket. Flanges come in threaded (screwed) connections, welded flanges, and clamp flanges. Flanges are always used in pairs; low-pressure piping can use threaded flanges, while flanges for pressures above four kilograms are焊接 flanges. Two flange disks are joined with a sealing pad and then fastened with bolts. Flanges of different pressures have different thicknesses, and they require different bolts. In the case of pumps and valves, when connected to pipes, the parts of these equipment are also made into corresponding flange shapes and are called flange connections. Any connection component that uses bolts to connect two flat surfaces and seal them is generally referred to as a "flange," such as the connection of ventilation pipes. Such components can be called "flange-type components." However, this type of connection is 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 devices like valves can be called "flange-type components."