電液比例閥與電液伺服閥最大的差別在于電機械轉換器。比例閥電機械轉換器采用比例電磁鐵,因此不論其是否帶檢測元件(反饋閉環),它的控制電流較大,從幾百毫安到1～2安培均有，故放大器功率大、價格高、且相對容易燒管子。這抵消了比例閥機械部件精度相對較低帶來的價格優勢,綜合可靠性較低
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