Flange (Flange), also known as flanges or flange flange. Flanges are interconnected between the tube and pipe parts for the connection between the pipe ends; import and export are also useful in the device on the flange for connection between the two devices, such as the reducer flange. Flange connection or flange joints, is defined by the flanges, gaskets and bolts of the three interconnected as a combination of a set of detachable connection seal structure. Pipe flange means plumbing fixtures in piping flanges, with import and export flange on the equipment means equipment. There are holes on the flange, so that the two flange bolts tightly connected. Between the flange sealing gasket. Threaded flange connection points (threaded connection) flanges, welded flanges and flange clip. Flanges are used in pairs, low-pressure pipe flange can be connected using wire, four kilograms more than the pressure of the use of welding flanges. Between the two flange gaskets, and then secured with bolts. Different flange thickness at different pressures, the bolts are used is also different. Pumps and valves, and pipe connections when local these facilities and equipment, but also made the corresponding flange shape, also known as the flange connection. Any use of the two planes simultaneously closed around the bolted connection components, generally known as the "flange", such as connecting ventilation ducts, this type of parts can be called "flange parts." But this is only a partial connection devices, such as flanges and pump connections, bad water pump called "flange parts." Relatively small, such as valves, etc., can be called "flange parts." Classification Method Editor plate flat welding steel pipe flanges 1, according to the chemical (HG) industry standard points: the overall flange (IF), threaded flange (Th), plate flat welding flange (PL), with neck butt Flange (WN), with neck flat welding flange (SO), socket welding flange (SW), loose flange welded ring (PJ / SE), flat welding ring loose flanges (PJ / RJ) , the liner flange cover (BL (S)), the cover flange (BL). 2, according to Sinopec (SH) industry standard points: threaded flange (PT), welded flange (WN), flat welding flange (SO), socket welding flange (SW), loose flange (LJ) flange cover (not table note). 3, according to the mechanical (JB) industry standard points: the overall flange, welded flange, welded flange plate, welded ring loose flange plate, flat plate welding ring loose flange, flange Loose plate flange, flange cover. 4, according to the national (GB) standard scores: overall flange, threaded flange, welded flange, with neck flat welding flange, with neck socket welding flange, welded neck collar with loose flange, plate flat welded flange, welded ring loose flange plate, flat plate welding ring loose flange, plate flange ring loose flange, flange cover.