Double Flange Dual Plate Swing Check ValveStructural FeatureShort structural length,only 1/4~1/8 of that of traditional flanged check valve;Low volume,light ... ,only 1/4~1/20 of those of traditional flanged check valve;Quick valve disc closedown,low water hammer pressure;Applicable for and ... ,SH3406,JB/T74;Inspection and test: API598,JB/T9092;Pipe flange: JB/T74~90,JB/T9112-9124, HG20592~20635, SH3406, ...