What are the flange classifications?

　　1. According to the standards of chemical industry, it can be divided into integral flange (if), threaded flange (th), plate flat welding flange (PL), diameter butt welding flange (WN), neck flat welding flange (so), socket welding flange (SW), butt welding ring loose flange (PJ / SE), flat welding ring loose flange (PJ / RJ), lining flange cover (BL (s)) and flange cover (BL).

　　2. According to the petrochemical industry standards: Pt, WN, so, SW, LJ and flange cover.

　　3. According to the mechanical industry standards: integral flange, butt welding flange, plate flat welding flange, butt welding ring plate loose flange, flat welding ring plate loose flange, flanging ring plate loose flange, flange cover.

　　4. According to national standards: integral flange, threaded flange, butt welding flange, flat welding flange with neck, socket welding flange with neck, loose sleeve flange with neck for butt welding ring, flat welding flange, loose sleeve flange for butt welding ring plate, loose sleeve flange for flat welding ring plate, loose sleeve flange for flanging ring plate and flange cover.

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