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cast steel check valve Design & Manufacture: API 6D, ANSI B16.34, BS 1868 Bolted Bonnet, Swing type Disc, Threaded or Welded Seat Ring Back-seating, Renewable Seat Ring Full Port or Reduced Bore Size Range : 2" to 48 "N.B Pressure Ratings: ANSI 150, 300, 600, 900, 1500, 2500 End Connections: Flanged, Buttweld, Socket Weld, Hub Connectors, Compact Flange or other Proprietary connections. Materials Available in: WCB, LCB, CF8, CF8M, CF3, CF3M, WC6, WC9, C5, C12 or Equivalent, available also in low temperature steels, low alloy steels, stainless steels, duplex type stainless steels and other exotic materials; Various trim materials available to suit service conditions. Various trim materials are available to suit different service conditions.