当M型和H型四位四通换向阀处于H位，即浮动位置，这时可以下铲取物料或者平整场地，铲斗可随地面的高低而升降，即实现浮动；另外这种回路在遇到系统突然停止工作时，仍能顺利放下铲斗。在履带挖掘机行走马达的换向阀上采用Y型滑阀机能的换向阀，它可以使挖掘作业时行走马达处于浮动状态不承受制动载荷
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