The part that connects the pipe to the pipe is connected to the pipe end. There are holes in the flange and bolts hold the two flanges together. Gasket seals between flanges. Flanged pipe fittings refer to pipe fittings with flanges (flanges or joints). It may be cast, threaded or welded. The flange connection consists of a pair of flanges, a gasket and a number of bolts and nuts.

There are three types of flange sealing surface: plane sealing surface, suitable for pressure is not high, non-toxic media occasions; Concave and convex sealing surface, suitable for slightly higher pressure occasions; Tenon groove sealing surface, suitable for flammable, explosive, toxic medium and high pressure occasions. Gasket is a kind of ring which can produce plastic deformation and has a certain strength. Most of the gaskets are cut from non-metallic sheets, or made in professional factories to specified sizes. The materials are asbestos rubber sheets, asbestos sheets, polyethylene sheets and so on.
Flange thread connection (wire connection) flanges and welded flanges and clamp flange. Low pressure small diameter threaded flange and sleeve flange, high pressure and low pressure large diameter are welded flange, flange thickness and connecting bolt diameter and number of different pressure is different.