隨著液壓傳動和液壓伺服系統的發展， 生產實踐中出現一些即要求能夠連續的控制 壓力、流量和方向，又不需要其控制精度很 高的液壓系統。由于普通的液壓元件不能滿 足具有一定的伺服性要求，而使用電液伺服 閥又由于控制精度要求不高而過于浪費，因 此近幾年產生了介于普通液壓元件 （開關控制） 和伺服閥 （連續控制） 之間的比例控制 閥。

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