| 摘要 |
The present invention reveals an improvement in an apparatus for injection molding a metallic material having dendritic properties. In the improvement, a sub--ring is placed under a piston ring on a sliding seal ring of a non-return valve assembly. The sub-ring seals the pressure and metal flow in the apparatus, virtually eliminates piston ring leakage and extends the usable life of the non-return valve assembly.
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