Air release valve flange

Flange, also known as a flange collar or rim, is a component used for connecting shafts or for joining pipe ends. It is also used on equipment inlets and outlets, such as reducer flanges, for connecting two devices. A flange connection or flange joint refers to a detachable connection consisting of a flange, a gasket, and bolts, which together form a combined sealing structure. Pipe flanges are those used for piping in pipe systems, and on equipment, they refer to the equipment's inlets and outlets. Flanges have holes, and bolts secure them together. They are sealed using a gasket. Flanges come in threaded (screwed) connections,焊接 (welded) flanges, and clamp flanges. Flanges are used in pairs; low-pressure piping can use threaded flanges, while pressures over four kilograms require焊接 flanges. Two flange discs are joined with a sealing pad and then tightened with bolts. Flange thickness and the type of bolt used vary with pressure ratings. Equipment like pumps and valves, when connected to pipes, have corresponding flange shapes, known as flange connections. Any connection piece that uses bolts to join two flat surfaces around the periphery and is sealed is generally called a "flange," such as in the connection of ventilation pipes. These components can be referred to as "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 equipment like valves can be referred to as "flange-type parts."