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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