... Connection:Butt Weld & Socket Weld & Thread 3)Standard:ASME,ANSI,BS,DIN,JIS,etc. 4)ISO 9001:2008 SO(Slip On) flange Flange typeSO( ... F5, F11, F22, 15CrMo, 12CrMoV, Q235, 16Mn, 20# etc.)ConnectionButt Weld & Socket Weld & ThreadPressure American Series: CLASS 150, CLASS 300, CLASS 400, CLASS ... TypesRaised Face(RF),Flat Face (FF),Ring-Type Joint (RTJ),Ring Type Joint gaskets,Tongue-and-Groove (T&G),Male ...