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ENQUIRY : Pressure Vent Valve DN 10 2pcs 1.Class 150# 2.Flanged 3. Body Al ,Surface seat: SS, or Teflon (PTFE) 4.Type of fluid = natural petrol gas out breath: min. 2390 Nm3/h Set Pressure 30 mmH2O In Breath: min. 1380 Nm3/h Set Vacuum 22 mmH2O. Were looking forward to receiving your kind reply.Must be a reputable supplier that can meet the specifications vent valve different items