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比例阀是一种新型的液压控制装置。在普通压力阀、流量阀和方向阀上，用比例电磁铁替代原有的控制部分，按输入的电气信号连续地、按比例地对油流的压力、流量或方向进行远距离控制。比例阀一般都具有压力补偿性能，输出压力和流量可以不受负载变化的影响 。

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电信号便于传递，能简单地实现远 距离控制

能连续、按比例地控制液压系统的 压力和流量，实现对执行机构的位置、速 度、力量的控制，并能减少压力变换时的冲 击。

减少了元件数量，简化了油路。

同时电液比例阀的使用条件和保养与一 般液压元件相同，比伺服阀的抗污染性能 强，工作可靠。

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