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Flange is to make the pipe with pipe connecting parts, connection in the pipe end. Flange connection or flange connection, it is to point to by the flanges, gaskets and bolts are mutually connected as a set of sealing structure detachable connection, pipe flange refers to the plumbing for piping flange, used in equipment refers to the import and export of the flange of the equipment. On the flange hole, two flange bolt that even tight. The flange gasket seal. Flange thread (thread) : the threaded flange is similar to the sliding flange, but the thread hole. Its main advantage is that it can not welding assembly, in the interpretation of the ordinary air temperature in the use of low pressure service and highly explosive area, create a dangerous welding. Sliding flange: a sliding flange has lower hub, because before entering the single flange welding pipe. This is the internal and external welding provide sufficient strength, prevent leakage. Sliding flange, a larger diameter pipe is boring matching. They are better than that of welding neck flange, due to the low initial cost, many users, but in the end, the ratio of installation cost probably won't because of the increase of welding neck flange. Lap joint flange: in the lap joint flange is actually the same sliding flange, unless it is in the hole and flange race between a radius. It is necessary to the radius of the flange for lap stub ends. Usually, at the end of lap joints flange and stub mating will assembly system together. The socket welding flange is a similar sliding flange, unless it has a hole and the hole size. Counter a little beer than O.D. pipe matching, make similar sliding flange pipe inserted into the flange.