... * Wide application range * CE,ISO9001~2000. * OEM service offer manual butterfly valve valve details :1.valve body:WCB,SS304,SS316, ... etc2.seal :metal seal ...3.Pressure :Pn10-4.Flange5.operation :manual or worm gear . shipping clause : 1). Delivery time After receive ... customers,which is the most suitable for the working environment. manual flange butterfly valve