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r900913443 4wra6w15-22/g24n9k4/v
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r900913446 4wraeb6ea30-22/g24n9k31/a1v
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r900921245 4wra6e30-22/g24n9k4/v-589
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r900925553 4wra6ea07-22/g24n9k4/v
气动控制系统中使用动作频率较低的开关式（on-off）的换向阀来控制气路的通断。靠减压阀来调节所需要的压力，靠节流阀来调节所需要的流量。这种传统的气动控制系统要想要有多个输出力和多个运动速度，就需要多个减压阀、节流阀及换向阀。这样，不仅元件需要多，成本高，构成系统复杂，且许多元件都需要预先进行人工调节。而电气比例阀控制属于连续控制，其特点是输出量随输入量（电流值或电压值）的变化而变化，输出量与输入量之间存在一定的比例关系。比例控制有开环控制和闭环控制之分。闭环控制有信号的反馈系统。
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