Flange, also known as a flanged disk or boss. A flange is a component that connects two shafts and is used for connecting pipe ends; it is also used at equipment inlets and outlets, such as a reducer flange. Flange connection or flange joint refers to a detachable joint that consists of a flange, gasket, and bolt, forming a combination seal structure. Pipe flanges refer to flanges used in piping installations, or specifically, the inlets and outlets of equipment. Flanges have holes, and bolts secure the two flanges together. They are sealed with a gasket. Flanges are available in threaded (screwed) connections,焊接 (welded) flanges, and clamped flanges. Flanges are used in pairs; low-pressure piping can use threaded flanges, while those above 4 kg of pressure use焊接 flanges. A sealing pad is placed between the two flange disks, then secured with bolts. Flange thickness and螺栓 types vary depending on the pressure rating. Equipment like pumps and valves, when connected to pipes, have corresponding flange shapes, also known as flange joints. Any connection piece that uses bolts to connect two flat surfaces and seal them is generally called a "flange," such as the connection in ventilation pipes. These parts can be referred to as "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 items like valves can be called "flange-type components."