结冰气候预防-检测管线系统后，阀门应该处于开启状态，做到排泄完全充分。

Freezing Weather Precaution - Subsequent to testing a piping system, valves should be in an open position to allow complete drainage.

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安装阀门时，蝶板应该处于关闭或几乎关闭的位置。这是为了防止蝶板密封装置受到损坏。

Valves should be installed with the disc in the closed or almost closed position. This will prevent damage to the disc sealing edge.

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