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    3. 閥門
      (DF先導式電磁閥)通電時,依靠電磁力提起閥桿,導閥口打開,此時電磁閥上腔通過先導孔卸壓,在主閥芯周圍形成上低下高的壓差,在壓力差的作用下,流體壓力推動主閥芯向上移動將主閥口打開;斷電時,在彈簧力和主閥芯重力的作用下,閥桿復位,先導孔關閉,主閥芯向下移動,主閥口關閉;電磁閥上腔壓力升高,流體壓力向主閥芯加壓,密封更好.