... 2''-48'' Class 150-class600 Wafer butterfly valve Size:2''-48'' Class 150-class600Wenzhou ONO Valve CO.,Ltd is a professional manufacturer of ... Temperature: -29°C - 425°C (WCB), -196°C - 600°C (SS) ±570°Calloy steel4) Suitable medium: water, oil, gas,vapor,steam ... 6) Stem material: 410(1Cr13),420(2Cr13), 304, 316, 304L, 316L, 38CrMoAlA, 25Cr1MoV7) Packing: graphite 8) Operating type: worm gear, ...