... ValveMain Features:For the structure of the triple-eccentricity seal butterfly valve, when the valve is under the ... ° to 0°, and only upon closing, the butterfly plate sealing face can contact and press onto the valve seat sealing ... Parameter SpecificationDesign and Manufacture:API 609,GB/T 12238Face to Face Dimension:API609,ISO5752,ASME B16.10,GB/T 12221Flange Connection ...