-比例电磁铁得电被激励后，会直接推动控制间芯(2)例如:控制电磁铁b (6)被散励
→控制阀芯(2)被推向左侧，位移与输入电信号成比例→这时，P口至A口及B口至T口通过阀芯与阀体形成的节
流孔接通，节流特性为渐进式-电磁铁(6) 失电
+控制阀芯(2)被对中弹簧(3)重新推回中位
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