... 3.PSB,long lifetime 4.CE,API,ISO certificates Cast Iron Flange blow down valve :Widely used for gas transmission ... carbon steel, low carbon steel, stainless steel, duplexstainless steel, high temperature alloys steel, MONEL, INCONEL, Hastelloy, titanium alloys and ... and limited source of analysis, design software, and with domestic and international customers,research institutes engaged in technical ...