... way butterfly valve/directional valve Certificataion:ISO,CE,API,ABS,WATERMAR History:17 years ... gate, globe, check, ball and butterfly valves with the materials of ductile iron, carbon steel, alloy ... Our products are designed and manufactured in accordance with the standards of GB, ASME, ANSI, API, ... .Certificates: We have held the certificates of ISO, ISO 9001, SAI Global Watermark, ABS (Design ...