Flanges are flanged parts. Flanges can be separate, called flanges, or combined, such as flanges at both ends of the valve, for easy installation of bolts. This article will introduce the material of the flange, the sealing surface form of the flange, and the classification of flanges according to national standards and chemical, petrochemical, and mechanical standards.
material
20# A105 Q235 A12Cr1MoV
16Mn R15CrMo18-8321
304 304L 316 316L
Form of sealing surface
Flat (FF) Raised (RF) Convex (M) Concave (F)
Concave and convex surface (MF) Tenon surface (T) Groove surface (G) Tenon and groove surface (TG)
Ring connection surface (RJ)
According to national standards
Integral Flange Threaded Flange Butt Welding Flange Neck Welding Flange
With neck socket welding flange butt welding ring with neck loose flange plate flat welding flange butt welding ring plate loose flange
Flat Welded Ring Plate Loose Flange Flanging Ring Plate Loose Flange Flange Cover
According to chemical industry standards
Integral Flange (IF) Threaded Flange (Th) Plate Flat Welding Flange (PL) Diameter Butt Welding Flange (WN)
Flat Weld Neck 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)
According to petrochemical industry standards
Threaded Flange (PT) Butt Welding Flange (WN) Flat Welding Flange (SO) Socket Welding Flange (SW)
Loose flange (LJ) flange cover (not shown)
According to machinery industry standards
Integral flange butt welding flange plate flat welding flange butt welding ring plate loose flange
Flat Welded Ring Plate Loose Flange Flanging Ring Plate Loose Flange Flange Cover
Classification of flanges
2023 02/27