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Classification of flanges

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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

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