The flange is a flanged part. The flanges can be separate, called flanges, or they can be combined, such as flanges at the ends of the valve for easy bolting. This article will introduce the material of the flange, the sealing surface form of the flange and the flange classification according to national standards and chemical, petrochemical and mechanical standards.
Material
20#A105Q235A12Cr1MoV
16MnR15CrMo18-8321
304304L316316L
Sealing surface form
Plane (FF) convex surface (RF) convex surface (M) concave surface (F)
Concave surface (MF) surface (T) groove surface (G) groove surface (TG)
Ring connection surface (RJ)
Divided according to national standards
Overall flange thread flange butt weld flange with neck flat weld flange
Neck socket socket welding flange butt welding ring with neck loose flange plate flat welding flange butt welding ring plate loose flange
Flat welding ring plate loose flange flange flange ring loose flange flange cover
Divided into chemical industry standards
Integral flange (IF) threaded flange (Th) plate flat welding flange (PL) with butt weld flange (WN)
Neck weld flat flange (SO) socket weld flange (SW) butt weld ring loose flange (PJ/SE) flat weld ring loose flange (PJ/RJ)
Lining flange cover (BL(S)) flange cover (BL)
Divided into petrochemical industry standards
Threaded flange (PT) butt weld flange (WN) flat weld flange (SO) socket weld flange (SW)
Loose flange (LJ) flange cover (not shown)
Divided into mechanical industry standards
Integral flange butt welding flange plate flat welding flange butt welding ring plate loose flange
Flat welding ring plate loose flange flange flange ring loose flange flange cover
Hex Flange Nuts,nut bolt,bolts nuts screws fasteners,bolt and nut
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