Flanges, also known as raised face plates or flanges, are components used for connecting shafts to each other, typically for pipe ends. They are also used on equipment进出口 for connecting two devices, such as reducer flanges. A flange connection or flange joint refers to a removable connection made up of a flange, a gasket, and bolts, forming a combination seal structure. Pipe flanges are flanges used in piping installations, while those on equipment refer 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 with a gasket. Flanges come in threaded (screwed) connections, welded flanges, and clamp flanges. Flanges are always used in pairs; low-pressure pipelines can use threaded flanges, while those above four kilograms of pressure use welded flanges. Two flange discs are fitted with a sealing pad and then bolted together. Flange thickness and bolt types vary with pressure ratings. Equipment like pumps and valves, when connected to pipes, have corresponding flange shapes for local connections, also known as flange joints. Any connection piece that uses bolts to connect two flat surfaces and is sealed is generally called a "flange," such as in ventilation pipe connections. Such components can be referred to as "flange-type parts." 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 part." Smaller items like valves can be referred to as "flange-type parts."
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