Common types of titanium flanges: PL plate flat welded titanium flanges; SO with neck flat welded titanium flange; WN neck welded titanium flange; IF integral titanium flange; SW socket welded titanium flange; TH threaded titanium flange; PJ/SE welding ring loose titanium flange; PJ/RJ flat welding ring loose titanium flange; BL titanium flange cover; BL (S) lined titanium flange cover. Common types of sealing surfaces: RF protruding surface; FM concave surface; M convex surface; MFM concave convex surface; T tenon surface; G groove surface; TG tenon groove surface; FF full plane; RJ ring connection surface.