FIELD: metallurgy.
SUBSTANCE: stopper system contains nozzle with through bore hole and stopper with nose. At stopper system occurrence in closed position, stopper nose and inner surface of nozzle rebore have a contact in contact point. On stopper nose and/or on inner surface of nozzle rebore there are implemented unevenness multitude. Unevenness are so located that at stopper system occurrence in open position, flow channel dimension between nose of stopper and nozzle bore hole is kept or discretely increase in function of distance downstream the contact point.
EFFECT: reduction of deposit formation on surfaces of nozzle and stopper.
12 cl, 8 dwg
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