可切断它的进回油路，使执行元件迅速停止运动。如图2所示：装载机动臂液压缸采用M型中位机能的换向阀构成的制动油路，动臂在将铲斗举升到位置和下降至放平位置时能自行限位制动，图中的回位限位阀（即M型和H型四位四通换向阀）是靠钢球定位的，
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0.25D18
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