Proportion/servo-valve的用法和样例：
例句
- Adding vibrationg signals in the direction of the variation of the control signal, overcome the friction of the proportional valve and the cylinder.
在控制信号变化的方向上叠加颤振信号，克服了比例阀和气缸的静态摩擦力。 - The swash plate variable displacement pump applied to an electro-hydraulic servo system usually induces unstable performance.
摘要电液比例阀控斜板式变量泵应用于液压伺服系统，常造成稳定性不良问题。
