The upper master valve is used on a routine basis, with the lower master valve providing backup or contingency function in the event that the normal service valve is leaking and needs replacement.
上部总闸门用于日常运行，而下部总闸门用于在正常使用的闸门发生渗漏并需要更换的情况下提供备用或应急的功能。
The upper master valve is used on a routine basis, with the lower master valve providing backup or contingency function in the event that the normal service valve is leaking and needs replacement.
上部总闸门用于日常运行，而下部总闸门用于在正常使用的闸门发生渗漏并需要更换的情况下提供备用或应急的功能。
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