PL flange from China is suitable for the connection of steel pipes whose nominal pressure does not exceed 2.5MPa. The sealing surface of PL flange can be made into three types: lubricated, concave-convex and tongue-and-groove. Lubricated PL flange has the largest application volume. It is mostly used for media Under relatively mild conditions, such as low-pressure non-purified compressed air, low-pressure circulating water.

　　
Flange classification:

1. According to the chemical industry (HG) professional standards: all flanges (IF), threaded flanges (Th), plate flat welding flanges (PL), neck butt welding flanges (WN), neck flat welding flanges (SO), socket welding flange (SW), butt welding ring loose flange (PJ/SE), flat welding ring loose flange (PJ/RJ), fabric flange cover (BL(S)), Flange cover (BL).
2. According to the petrochemical (SH) professional standards: threaded flange (PT), butt welding flange (WN), flat welding flange (SO), socket welding flange (SW), loose flange (LJ) , Flange cover (not shown).
3. According to the mechanical (JB) professional standards: all flanges, butt welding flanges, plate flat welding flanges, butt welding ring plate loose flanges, flat welding ring plate loose flanges, flanged ring plate loose flanges Flange, flange cover.
4. According to national (GB) standards: all flanges, threaded flanges, butt welding flanges, flat welding flanges with necks, socket welding flanges with necks, butt welding ring loose flanges with necks, plate flat flanges Welding flanges, butt-welding ring plate loose flanges, flat welding ring plate loose flanges, flanged ring plate loose flanges, flange covers.