The reason to use pure water is to limit the corrosion potential of the coolant water during normal operation.

用纯净水的目的是为了限制日常操作中对冷却剂潜在的腐蚀。

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Corrosion products formed by these reactions can prevent normal valve operation and can become embedded in the elastomeric stem tip, preventing the valve from making a complete seal.

这些反应产生的腐蚀产物会阻止正常的阀门运转，深入到人造橡胶阀杆顶端，造成阀门不能完全密封。

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Maintenance efforts focus on corrosion prevention and removal in addition to normal checks for wear and free play.

维护时应当重点关注腐蚀的预防和去除并加强常规检查，防止损伤和自由位移。

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