... .0(class 300), PN6.8(class 400), PN10.0(class 600), PN15.0 (class 900), PN25.0(class 1500), PN42.0(class 2500 ... Flanges(GOST12821-80); Steel Butt-Welded Flanges GOST12821-80Pressure Class:PN=0.6--PN10,0 (100 /2)SIZE ... Welding, Lap Joint,Threaded and Plate etc.Pressure Ratings: Class 150, 300, 600, 900, 1500 and2500.Pressure Ratings: PN ... F304L,F316/F316L 7 AWWA C207 4"--144" Class B,D,E,F T/1 PL A105, ...