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比例阀采用阀芯+阀体结构。伺服阀和伺服比例阀主要应用在闭环控制系统，比例阀的驱

动装置是比例电磁铁。
伺服阀的驱动装置是力马达或力矩马达.阀体兼作阀套。
驱动装置不同.所以近些年出现了比例伺服阀。
比例阀一般最高几十Hz，伺服阀中位没有死区，伺服阀对液压油液的要求更高.性能参数

不同；否则容易堵塞，
用来控制流量和流向，比例阀要求低一些.比例阀有中位死区；
比例阀和伺服阀的区别主要体现在以下几点：
逐渐向伺服阀靠近，
比例换向阀属于比例阀的一种，滞环、中位死区、频宽、过滤精度等特性不同.阀的额定

压降不同；比例换向阀具有与普通换向阀相似的中位机能，
而比例伺服阀性能介于伺服阀和比例阀之间，因此应用场合不同，伺服阀和伺服比例阀

采用阀芯+阀套的结构。中位机能种类不同.其它结构的比例阀主要应用在开环控系统及

闭环速度控制系统；因为比例阀的性能越来越好；2伺服阀的频响（响应频率）更高。阀

芯结构及加工精度不同.伺服阀与比例阀之间的差别并没有严格的规定。

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