Flange Type Cast Iron Check Valves 1.Size:DN15-DN700 2.Pressure:150LB-1500LB 3.Bolted Bonnet 4.Medium:Water, Oil, Gas, A Connection:Flange or Butt-Welding EndsMaterials: WCB, CF8, CF8M, CF3, CF3MApplicable Medium: Water, Oil, Gas, AcidWorking Pressure:150LB-1500LBManufacture:API6DFace to Face: ANSI B16.10Flange Dimension: ANSI B16.5Checkand Test: API 598 A.