... class150), PN5.0(class 300), PN6.8(class 400), PN10.0(class 600), PN15.0 (class 900), PN25.0(class 1500), PN42.0(class 2500) 4. ... GOST12836-67); Wedling neck Flanges(GOST12821-80); Steel Butt-Welded Flanges GOST12821-80Pressure Class:PN=0.6--PN10,0 (100 /2 ... Steel Flange Type: Slip-On, Welding Neck, Blind, Socket Welding, Lap Joint,Threaded and Plate etc.Pressure Ratings: Class 150, 300, 600, 900, 1500 ...