... gate, globe, check, ball and butterfly valves with the materials of ductile iron, carbon steel, alloy steel, stainless steel, ultra-low carbon ... products are designed and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN, JIS etc. We ... clients on your request.Certificates: We have held the certificates of ISO, ISO 9001, SAI Global Watermark, ABS (Design Assessment ...