1.Concentric type 2.Variety application 3.Replaceable spare parts ... ″-1914.347.6331.75Name:ValvesMaterials : 1.Body : Cast Iron , Ductile Iron , Aluminum Bronze, Carbon Steel, SS304 2.Disc : ... Ductile Iron , Bronze , SS316 3.Seat : EPDM ,NBR , PTFE , VITON ... , gear operator , pneumatic actuator, electric actuator Centerline wafer type butterfly valve with pin