valves, including seat rings and guides

inlet and exhaust valves, valve seat rings and valve guides in accordance with HATZ drawings and specifications. Messing or grey cast iron guides; semi-steel centrifugal cast valve seat rings; valves made of X45CrSi93 or X53CrMnNiN219 bimetal material (collet) and X45CrSi93 (stem) for exhaust valves.