电磁力先导小阀，主阀下腔压力上升，上腔压力下降，从而利用压差把主阀向上推开；断电时，先导阀利用弹簧力或介质压力推动关闭件，向下移动，使关闭。 特点： 在零压差或真空、高压时亦能可动作，但功率较大，要求必须水平安装。阿托斯溢流阀
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