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(jìn)行調(diào)節(jié)。通常是采用比例電磁鐵將輸入的電信號轉(zhuǎn)換成力或者閥的機(jī)械位移量進(jìn)行控制。
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