... layer, increase the life of the seal; The valve body and cover adopt WCB steelcastings, filler/packing used high ... RatingASME B16.34Test And InspectionMSS SP81,MSS SP61,API598,ISO5208Type Of OperationGear,Electric,Pneumatic,Manual-Air-HydraulicDN(NPS) ... the power generation, chemical andpetrochemical, oil and gas, pulp and paper,mining, and ship-building industries. We concentrate onone business ...