... :2''-48'' Class 150-class600 Wafer butterfly valve Size:2''-48'' Class 150-class600Wenzhou ONO Valve CO.,Ltd is a professional manufacturer of ... , CF8M etc.6) Stem material: 410(1Cr13),420(2Cr13), 304, 316, 304L, 316L, 38CrMoAlA, 25Cr1MoV7) Packing: graphite 8) Operating type: worm gear ... out for your confirmation before after place order. wafer type butterfly valve