利用弹簧的压力调节、控制液压油的压力大小。从图中可以看到:当液压油的压力小于工作需要压力时,阀芯被弹簧压在液压油的流入口,当液压油的压力超过其工作允许压力即大于弹簧压力时,阀芯被液压油顶起,液压油流入,从图示方向右侧口流出,回油箱R900434128 DBDH6P1X/400
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