1、先导气全封闭内排式，适用于超净环境，也可防止外办粉尘封闭内部污染；
2、线畔功耗低，AC型为2VA、DC型为1W；
3、反应速度快、作动灵敏、长时间工作，换向性能稳定；
4、内部与外部先导方式可选；
5、线圈（先导阀）与阀体可灵活、多方向安装；
6、底座与4V系列通用。
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