但在液压回路中需要油流反向流动时又可利用控制油压，打开单向阀，使油流在两个方向都可流动。
However, the need for oil flow in hydraulic circuit reverse flows can use hydraulic control, opening a one-way valve, so that the flow of oil can flow in both directions.
用于液压系统中防止油流反向流动。
For the hydraulic system to prevent reverse flow of oil flow.
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