pneumatic butterfly valves Size Range:DN50~DN600 Structure:butterfly valve CE,API,ISO,ABS pneumatic butterfly valvesSize Range: DN50~DN600Class Range: 150LB-900LB/ ... : We can produce gate, globe, check, ball and butterfly valves with the materials of ductile iron, carbon steel, alloy ... Watermark, ABS (Design Assessment Certificates), API 6D, CE/PED for many years and view the ISO 9001 as the minimum ...