... (DN25---DN200)B: Model: D971 C: Products Introduction:The butterfly valve applied to the industries of food, beverage, pharmaceutical, chemical purify ... and regulating the flow purposes Suitable medium: water, sewage, water, air, steam, acid, salt, oil D: Pressure Class: 1.0Mpa, 1 ... , PTFE rubber, ethylene propylene rubber, wear rubber Electric control on off valve