API swing check valve Materials: WCB, CF8, CF8M, CF3, CF3M Applicable Medium: Water, Oil, Gas, Acid API cast steel swing check valve,swing check valveBolted BonnetFlange or Butt-Welding ... Face: ANSI B16.10Flange Dimension: ANSI B16.5Check and Test: API 598 API 6D API cast steel swing check valve Bolted Bonnet