butterfly valve material:grey cast iron,ductile cast iron Butterfly valvemain material:grey cast iron,ductile cast iron,carbon steelDN:50-500,600-1000,120-1600PN(MPa):16(1.6),10(1.0),6(0.6)Working pressure: -45oC__130oCSuitable medium:Fresh water,Waster water,Vapour,Gas,oils,Acid and alkalineType of actuator:Handle,gear