... 4.CE,API,ISO certificates Cast Iron Flange blow down valve :Widely used for gas transmission pipeline, regulating ... offered High quality,reasonable priceOur production process are made under ISO9001,CE ,API strictly Note: Flange Blow down valve as ... steel, high temperature alloys steel, MONEL, INCONEL, Hastelloy, titanium alloys and othermaterials. The valve structure, performance, quality has reached ...