... CE,ISO9001~2000. * OEM service offer manual butterfly valve valve details :1.valve body:cast iron ,wcb ,ss304,ss316,etc2.seal : ... .operation :manual or worm gear . shipping clause : 1). Delivery time After receive deposit,we need 10~15 days ... We may need 7 days to make the sample with 1 pc , also we need the sample fee and the ... most suitable for the working environment. butterfly valve with worm gear