Classification of flanges

Material 20#A105Q235A12Cr1MoV16MnR15CrMo18-8321304304L316316L Sealing Surface Form Flat (FF) Protruding Surface (RF) Convex Surface (M) Concave Surface (F) Concave-convex Surface (MF) Tenon Surface (T) Groove Surface (G) Tongue and Groove Surface (TG) Ring Connection Surface (RJ) According to the national standard, it is divided into integral flange, threaded flange, butt welding flange, neck flat welding flange, neck socket welding flange, butt welding ring, neck loose sleeve flange, plate type flat welding flange, butt welding ring, plate type loose flange Sleeve flange flat welding ring plate loose flange flange Flanging ring plate loose flange flange cover is divided into integral flange (IF) threaded flange (Th) plate flat welding flange (PL) according to chemical industry standards Butt Weld 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 Method According to the petrochemical industry standard, flange cover (BL (S)) is divided into threaded flange (PT) butt welding flange (WN) flat welding flange (SO), socket welding flange (SW), loose sleeve Flange (LJ) flange cover (not shown in the table) is divided into integral flange butt welding flange plate flat welding flange butt welding ring plate loose flange flat welding ring plate loose flange flange flange according to machinery industry standards Plate type loose flange flange cover