FIELD: foundry.
SUBSTANCE: invention relates to foundry. Piston comprises a body, head 12 of which ends with front surface 13, moving molten metal. In body there is annular seat 18 for accommodation of sealing ring 16. In intermediate annular portion of lower surface of seat there is an annular distribution channel 24 communicating with front surface of piston 13 via at least two inclined connecting holes 30. Cross-section of holes 30 increases towards distribution channel. Molten metal penetrates into connecting holes and into distribution channel 24, acting on sealing ring. Conical shape of holes 30 prevents return of metal to piston head.
EFFECT: higher reliability of compensating for wear of sealing ring.
14 cl, 13 dwg
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