用定量泵供油時，它與節(jié)流閥配合，可以調(diào)節(jié)和平衡液壓系統(tǒng)中的流量。在這種場合下，閥門經(jīng)常隨著壓力的波動而開啟，油液經(jīng)閥門流回油箱，起著定壓下的溢流作用DBD溢流閥
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