1 Cast iron valve body 2. spare parts for butterfly valve. 3. material: grey iron or ductile iron... Cast iron valve bodyspare parts for butterfly valve,material: grey iron GG 25 or ductile iron 40Standard : AISI, ASTM, JIS, BS, DIN, ISO Unit weight : up to 2500 kg Process : iron casting + complete machining + painting. Cast iron valve body