Spare parts for machines, namely, piston rings, sealing rings, metal and non-metal component part gaskets, guide rings, piston rod sealing elements, pressure breakers, support rings, piston rod packings, intermediate packings, valves, oil wipers, oil wiper packings, shaft seals, face seals, labyrinth seals, and shutdown seals, all being machine elements for machines under rotary and/or oscillatory stress, namely, reciprocating compressors, rotating compressors, screw compressors, turbo compre...