API 6D Swing check valve

API 6D Swing check valve Design standard ：API 6D     API 594     BS1868 Product range ： 1.Pressure range ：CLASS    150Lb~2500Lb 2.Nominal diameter ：  NPS        2~60″ 3.Body material：Carbon steel, Stainless steel, duplex stainless steel, Alloy steel, Nickel alloy 4.End connection ： RF   RTJ   BW Product features： 1.Small flow resistance for fluid； 2.Rapid opening and closing, sensitive action 3.With small close impact, not easy to product water hammer . 4.Equipped with counterweight, damper or gearbox is available as per customer request; 5.Soft sealing design can be chosen; 6.Can choose to lock the valve position in the fully open position 7.Jacketed design can be chosen.；