Flange, also known as a flange disk or raised rim. A flange is a component used for connecting shafts to each other, typically for joining pipe ends; there are also flanges used at equipment inlets and outlets for connecting two devices, such as a reducer flange. Flange connection or flange joint refers to a detachable connection consisting of a flange, a gasket, and bolts combined to form a sealing assembly. Pipe flanges are the flanges used for piping in a pipeline installation, or on equipment, referring to the inlets and outlets of the equipment. Flanges have holes and bolts are used to tightly secure them together. They are sealed using a gasket. Flanges are available in threaded (screwed) connections, welding flanges, and clamping flanges. Flanges are used in pairs; low-pressure piping can use threaded flanges, while those above four kilograms of pressure require welding flanges. Two flange disks are joined with a sealing pad and then securely fastened with bolts. Flange thickness varies with pressure, and so does the type of bolt used. In pumps and valves, the local parts that connect to pipes are also shaped as corresponding flanges, known as flange connections. Any connection piece that uses bolts to join two flat surfaces while also sealing is generally called a "flange," such as the connection of ventilation pipes. Such parts can be referred to as "flange-like components." However, this type of connection is only a local part of a device, like the connection between a flange and a pump, so it's not appropriate to call the pump a "flange-like component." Smaller components like valves can be called "flange-like components."