... Steel Check Valve 1. High quality but competitive price; 2. Easy installation; 3. Safety and convenient. Cast Steel Check ValveFeatures ... & Specifications.Design & Manufacture: API6D, ANSI B16.34, BS1868.Bolted Bonnet, Swing Type Disc, ... 600, 900, 1500, 2500.End Connections: Flanged, Buttweld, Socket Weld, Hub Connectors, Compact Flange or other proprietary connections. ...