水-空气的混合液是经接口排泄，这个管路可以用作泄放，但是不能关闭。
The water-air mixture is drained through connection the connection pipeline may be used for drainage, however it must not be lockable.
打开系统较高点的泄放口，排出收集的空气，直至液体液柱流出现。
Open bleed port at high point in system and vent trapped air until a solid stream of liquid emerges.
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