Flange end air valve used in pipelineMaterial: Body: Ductile IronSmall float ball: ABSLarge float ball: ABSBolt: SteelBall Seal Large Oriflce: EPDMLarge Orifice Cove: Ductile IronDust Cap: Ductile IronNut: SteelWasher: SteelBolt: SteelBall Seal Small Orifice: EPDMAir Release Nipple: Cast BrassSmall Orifice Cover: Ductile IronNut: SteelWasher: SteelScrew Plug: Cast BrassSuitable meduim: WaterNormal pressure: 1.6MpaShell test pressure: 2.4MpaSeat Test pressure: 1.6MpaFlanges drilled conforms to BS4504