1,doubile disc cast iron check valve 2,ISO9001 and CE Certificate 3,doubile disc 4,do OEM Double Disc Check Valve Technical Date ... :Water,Sewage,Seawater,Gas,Food,Oils,etc.Double Disc Check Valve Standard:Design Standard:JB/T8527-97 Structural Length:GB/T12221 ... Standard:GB/T17241.6 Type of connection:Double-clipType Check valve