V51B511A-A213J英国诺冠norgren双电控电磁阀

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2636065.3824.02400 自由交叉式切换，即便在很小的横切面时也能保证切换功能；
              即便在电源故障时也能由机械返回式弹簧复位（单稳态样式）；
              附加手动应急控制，如果按照了相应的电磁线圈可适用于室外安装；