六、比例方向流量阀(proportional direction flow valve) 比例方向流量阀不仅用来改变液流方向，而且可以控制流量的大小。这种阀又分为比例方向节流阀和比例方向调速阀两类。
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分别采用比例方向流量阀和比例溢流阀来实时控制输送带张力，并分别介绍了其工作原理。
The proportional direction valve and the proportional relief valve were adopted to timely control the belt tension and its working principles were introduce.
该方法解决了电液比例方向阀稳态流量特性测试中保持阀压降恒定的问题。
The method solved the problem of invariable pressure difference when the valve was tested.
于是在实际上比例阀可以同时作为方向阀和流量阀来使用。
So in effect the proportional directional valve is acting as both a directional valve and a flow control valve.
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