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what is the different between GG 25 and GGG 40 ?
GG25 is cast iron. GGG40 is ductile iron.
it means that the ductile iron more flexible than cast iron ???
and if i have a valve made from GGG40 and GG25 ??? will be in on suction pipe 16 bar (kg/cm@)
which will be the suitable ?