polyurethane wafer Butterfly Valve Butterfly Valve Without Pin/Disc coated polyurethane olyurethane Wafer Butterfly Valve Design & Manutacture acc. to : API609, MSS SP-67, BS5155 ... DIN3202, API609, MSS SP-67, BS5155, BS EN558.\Top Flange acc. to ISO 5211.Pressure test acc. to API598, BS ... EN12266-1, DIN3230, BS5155. Side Flange acc. to DIN2501, ANSI125/150, AS2129, BS4504, BS10D&E, ...