... Certificataion:ISO,CE,API,ABS,WATERMAR History:17 years (Since1994) 3-way butterfly valve/directional valveSize Range: DN15~DN3500Class Range: 150LB- ... We can produce gate, globe, check, ball and butterfly valves with the materials of ductile iron, carbon steel, alloy steel, stainless ... to order. Our products are designed and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN ...