tender for disc for 300nb tyco make manual bf valve ofapw phe , spare disc for manually operated butterfly valves of apw plate type heat exchanger item at sr. no. 1.2 of the drawing raps-56-70000-6012-dd moc cf8m moc is upgraded from astm-216a sr. wcb in the original drawing to cf8m size-300nb make- emerson process management india pvt. ltd.