液壓油的壓力越大，閥芯被液壓油頂起得越髙，液壓油經(jīng)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(jìn)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(shí)總會(huì)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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