電液比例控制閥（簡稱比例閥）實質上是一種廉價的、抗污染性能較好的電液控制閥。比例閥的發(fā)展經(jīng)歷兩條途徑，一是用比例電磁鐵取代傳統(tǒng)液壓閥的手動調(diào)節(jié)輸入機構，在傳統(tǒng)液壓閥的基礎下：發(fā)展起來的各種比例方向、壓力和流量閥；二是一些原電液伺服閥生產(chǎn)廠家在電液伺服閥的基礎上，降低設計制造精度后發(fā)展起來的

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