利用H型、Y型换向实现浮动。例如液压起重机的回转机构在负载下回转时，如果制动过急，惯性力将产生很大的液压冲击，因此，常常采用滑阀机能为H型或Y型的换向阀，如图3所示，当换向阀回中位时，回转马达处于浮动状态，然后再用脚制动使它平稳的停止转动。图2所示的装载机动臂液压缸
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