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The effectiveness of cast iron inoculation performed by means of three various inoculants: FeSiSr–SYSTR 75 AV, FeSiZr–SYZR 25 AV and Zircinoc was determined. The inoculants were introduced to the cast iron during the pouring of production moulds. Examination of cast iron structure and mechanical properties were carried out for specimens cut out of the collars of the cast valve bodies. It was found...