{
  "text": "此处以托架马达向前为例说明，当操作手操作托架马达向前时，来自负载侧的压力会将托架多路换向阀连接块内的三通流量调节阀关闭，此时来自前泵的液压油无法通过托架多路换向阀连接块内的三通流量调节阀返回液压油箱，应通过托架多路换向阀内部通道进入托架马达换向联，而后进入液压马达，推动液压马达旋转。",
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