无严重影响触头盒绝缘的气体、蒸汽、灰尘及其它爆炸性和腐蚀介质的场所。
NO gas , wapor or dust that may severely affect the insulation of contact box, no explosive or corrosive substance.
疏水阀内的膜盒充满了混合物，其沸点比蒸汽稍低一些。
The bellows inside the trap is filled with a mixture that is set to boil at a temperature slightly lower than the steam.
疏水阀处于关闭状态，直到蒸汽足够冷却到凝结为凝结水。这时膜盒重新回缩并让水流进回路管道。
The trap remains closed until the steam cools and condenses into water. The bellows retracts to allow the water into the return piping.
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