... 2)personality service High Quality Stainless Steel Pneumatic Wafer Type Butterfly Valves Technology parameter : Medium Temperature-40 ~ 90°C NBR, -20 ~ 200 ... °C VITONWorking MediumWater, air, gas, weak corrosive fluids.DN(mm)50 ~ 800Nominal PressurePN0.6, 1.0, 1.6Mpa Factory history14 yearsCertificateISO ... follows:About us High Quality Stainless Steel Pneumatic Wafer Type Butterfly Valves