heat insulation jacket butterfly valve SizeRange:DN50~DN2500 Structure:butterfly valve CE,API,ISO,ABS high pressure steam butterfly ... : 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, JIS ...