In construction and mining equipment that are subjected to large variation in load, the valve controlled hydro-motor drives are commonly used. The said drive is usually in open-loop configuration where by controlling the valve, the variable flow is supplied to the actuator to regulate its rotational speed. The performance of such valve is almost same as that of the servo-valve; however, it is less expensive and high responsiveness.

中文翻译：

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开环比例阀控制静液压传动的动态分析

在承受较大负载变化的建筑和采矿设备中，通常使用阀控液压马达驱动器。所述驱动器通常处于开环配置，其中通过控制阀，可变流量被供应至致动器以调节其旋转速度。这种阀的性能几乎与伺服阀相同。但是，它便宜且响应速度快。