Flange, also known as flange or flange plate. Flanges are interconnected so that the tube with the tube parts connected to the tube end; also useful device ago on the flange, for the connection between the two devices, such as the reducer flange. Flange connection or flange joints, flanges, gaskets and bolts three interconnected as a combination of sealing structure removable connection, the flange pipe flanges means piping plumbing fixtures, used in the device refers to equipment and outlet flanges. Holes in the flange, bolt the two flange abuts. Flange gasket sealing. Flange points threaded flange connection (threaded connection) flange and welded flange and clip.

Reducer flange for the connection between the connection of motor and reducer, reducer and other equipment.

GB flange English the (National standardflange) is the production in the People's Republic of China national standard "GB / T 9112 ~ 9124-2010 steel pipe flange" provisions piece flange.
GB Flange Standard 2011-01-10 jointly issued by the State Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and the China National Standardization Management Committee, recommended standards implemented since 2011-10-01.
GB / T 9112 ~ 9124-2010 includes a total of 13 standard:
Instead of GB GB/T9112-2000; GB/T10745-1989 standards
GB / T 9112-2010 steel pipe flange type with parameters
GB / T 9113-2010 Integral steel pipe flanges
GB / T 9114-2010 hubbed steel pipe flanges
GB / T 9115-2010 welded steel pipe flange
GB / T 9116-2010 with a neck flat welding steel pipe flanges
GB / T 9117-2010 hubbed socket welding steel pipe flanges
GB / T 9118-2010 butt ring with a neck loose tube steel pipe flanges
GB / T 9119-2010 plate flat welding steel pipe flanges
GB / T 9120-2010 butt Loose plate steel pipe flanges
GB / T 9121-2010 flat weld Loose plate steel pipe flanges
GB / T 9122-2010 flanging Loose plate steel pipe flanges
GB / T 9123-2010 steel pipe flange cover
GB / T 9124-2010 Steel Pipe Flanges
Technical conditions
This standard specifies the pressure mark into PN markers and Class mark.
PN mark (12) pressure levels
: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400
Class mark (6) pressure rating
Were: Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500
GB flange another meaning: in accordance with the the production flange dimensions, tolerances scope of the national standard requirements, different from the standard size piece flange, also known as two standard flange (it was called non-standard flange is incorrect), usually some unscrupulous businesses will reduce the thickness of the flange, the outside diameter of the two dimensions to achieve material savings, as well as with scrap steel flange or scrap steel processing, usually steel chemical composition and mechanical performance is not up to waste or, worse, with black steel mills private steelmaking production flange, this private steel making use of obsolete steelmaking technology can not guarantee that the mechanical properties and welding performance, may not be able to use and steel pipe welding, or steel itself leaking cracks, porosity welded up also. So, try to use GB buy flange flange. If the case of the limited choice of funds two standard flange must be carefully observed and measuring flange dimensions so as not to be fooled.