Detailed Product Description Standard and regulationDesign and manufacture: GB12240Face-to-face-dimension: GB12221, ASME B16.10, DIN3202Flange connection dimension: GB/T9113, JB/79, ASME B16.5, DIN2543-2545Inspection and test:? GB/13927, API598, API6D, DIN3230Main material: Cast iron, Carbon steel, Stainless steel