液壓油的壓力越大，閥芯被液壓油頂起得越髙，液壓油經溢流閥流回油箱的流量越大如過液壓油的壓力小于或等于彈簧壓力，則閥芯落下，封住液壓油進口。由于油泵輸出的液壓油壓力固定，而工作油缸用液壓油的壓力總要比油泵輸出液壓油壓力小，所以正常工作時總會有一些液壓油從溢流閥處流回油箱，以保持液壓油缸的工作壓力平衡、正常工作DBW溢流閥
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