This paper introduces the structure, work laws and process of overfall valve and rotate speed control valve in a lately devel oped cleaner.
2
分别采用比例方向流量阀和比例溢流阀来实时控制输送带张力，并分别介绍了其工作原理。
The proportional direction valve and the proportional relief valve were adopted to timely control the belt tension and its working principles were introduce.
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