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.
液压控制技术：液压方向、压力、流量控制阀、比例阀、球阀。
Hydraulic control technology: hydraulic direction, pressure, flow control valve, proportional valve, ball valve.
液压控制技术：液压方向、压力、流量控制阀、比例阀、球阀。
Hydraulic control technology: hydraulic direction, pressure, flow control valve, proportional valve, ball valve.
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