1.16 years management 2.Standard: ANSI,ASME,DIN,API 3.flange,DN40-500,PN16 cast steel swing check valveFeatures:1.Bolted cover2.Flanged or butt-welding ends3.Manufacture in accordance with API 6D4.Face to face/End to end.dimensions to ANSI B 16.105.Flange dimensions to ANSI B 16.256.Butt-welding end dimensions to ANSI B 16.257.Valve tested to API 6D Cast Steel Swing Check Valve