Flange, also known as Flange Flange disk or Flange. The flange is the connecting part between the shaft and the shaft, which is used for connecting the pipe ends. Also useful in the equipment inlet and outlet flange, for the connection between two equipment, such as reducer flange. Flange connection or flange joint, refers to the flange, gasket and bolt three mutual connection as a group of group sealing structure detachable connection. Pipe flanges refer to the flanges used in piping installation and used in equipment to refer to the inlet and outlet flanges of the equipment. There are holes in the flange and bolts make the two flanges tightly connected. Gasket between flanges. Flange threaded connection (threaded connection) flange, welding flange and clamping flange. Flanges are used in pairs, low pressure pipe can be used wire flange, more than four kilograms of pressure use welding flange. Insert gasket between two flanges and tighten with bolts. The flange thickness varies with the pressure and the bolts used vary. Pumps and valves, when connected to the pipe, the parts of the equipment, also made corresponding flange shape, also known as flange connection. General in two plane peripheral use bolt connection at the same time closed connection parts, generally known as "flange", such as the connection of the ventilation duct, this kind of parts can be called "flange parts". But this connection is only a part of the equipment, such as flange and pump connection, it is not good to call the pump "flange parts." Relatively small, such as valves, can be called "flange parts."

1. According to the industrial standard of chemical industry (HG), it is divided into: integral flange (IF), threaded flange (Th), plate welding flange (PL), butt-welded flange (WN), butt-welded flange (SO), socket welding flange (SW), butt-welded ring loose sleeve flange (PJ/SE), butt-welded ring loose sleeve flange (PJ/RJ), lining flange cover (BL(S), flange cover (BL).

2, according to the petrochemical (SH) industry standard: threaded flange (PT), butt welding flange (WN), flat welding flange (SO), socket welding flange (SW), loose flange (LJ), flange cover (not note).

3, according to the mechanical (JB) industry standard: integral flange, butt welding flange, plate flat welding flange, butt welding ring plate loose cover flange, flange flange flanges flanges, flange cover.

4, according to the national (GB) standard points: overall flange, threaded flange, butt welding flange, neck flat welding flange, neck socket welding flange, butt welding ring neck loose sleeve flange, plate flat welding flange, butt welding ring plate loose sleeve flange, flanges flanges, flange cover.