The paper analyses the problems of existing flat gate valve used in dense-medium system pipeline and introduces anti-friction qualities and functions after improvement.

分析了重介质系统管路中平板闸阀存在的问题，介绍了改进后的耐磨特点和性能。

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Discusses the existing problems of slime dense medium system in Xiqu coal mine preparation plant, points out the solved methods, provides experience for preparation plant improving.

探讨了西曲矿选煤厂煤泥重介系统存在的问题，提出了具体的解决办法，为选煤厂改造提供经验。

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