Flange, also known as a flanged boss or rim, is a component used to connect shafts to shafts, typically for pipe end connections. It is also used on equipment进出口, like reducer flanges, for connecting two devices. A flange connection or flange joint refers to a removable connection consisting of a flange, a gasket, and bolts, forming a combined sealing structure. Pipe flanges are the flanges used in piping installations, or on equipment, referring to the equipment's进出口 flanges. Flanges have holes and bolts are used to tightly secure the two flanges together. They are sealed using a gasket. Flanges are available in threaded (screwed) connections,焊接 flanges, and clamping flanges. Flanges are used in pairs; low-pressure pipelines can use threaded flanges, while those above four kilograms of pressure require焊接 flanges. Two flange disks are sealed with a gasket and then fastened with bolts. Flange thickness and the bolts used vary with pressure. In pumps and valves, the parts that connect to pipes are also made in a flanged shape, referred to as flange connections. Any connection piece that uses bolts to connect and seal two flat surfaces is generally called a "flange," such as in ventilation pipe connections. Such parts can be called "flange-type parts." However, such connections are only 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 part." Smaller items like valves can be referred to as "flange-type parts."