柱塞向上供油，当上行到柱塞上的斜槽（停供边）与套筒上的回油孔相通时，泵 油室低压油路便与柱塞头部的中孔和径向孔及斜槽沟通，油压骤然下降，出油阀在弹 簧力的作用下迅速关闭，停止供油
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一八七七一零二二八二九
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