... valve such as 3 piece floating balll valve2 piece floating ball valve,reduce ball floating ball ,top entry floating ball valve,etc Note: ... scour to seal face, wear, ensure valve seallasting effective.2, single seat design can effectively prevent the deposition of ... ,ISO5208Type Of OperationGear,Electric,Pneumatic,Manual-Air-HydraulicDN(NPS)2"~24"PN(LB)Class 150LB~600LBMain MaterialsCarbon Steel:WCB, ...