主要用于成比例的控制液壓系統(tǒng)中的壓力或者流量比例控制閥的輸出量（流量、壓力）可以按照輸入信號的變化規(guī)律連續(xù)成比例地進行調節(jié)。通常是采用比例電磁鐵將輸入的電信號轉換成力或者閥的機械位移量進行控制。
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