| 摘要 |
An upper feeder with a spherical top and a trap of the metal jet contains a crucible, and near the casting of secondary unit on the lower disk - sealed grooves. Additionally, in the bottom part the feeder contains the trap of the metal jet. Moreover, the diameter of the trap C on its upper edge at least is equal to the smallest diameter B of the crucible, and the height of arrangement to its upper edge K is equal to at least 0.5 of the height of the nave L of the casting of impeller.
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