应当注意，出口止回阀不能装反或出现卡死现象。
It should be noted that exports can not check valve or a card with the anti-death phenomenon.
应当注意，出口止回阀不能装反或出现卡死现象。
It should be noted that the outlet check valve cannot be installed backwards or stuck.
在这种位置，安全阀位于第一止回阀下面，使得这个区能够通过安全阀出口排放。
This positions the relief valve below the first check valve, enabling the zone to drain through the relief valve outlet.
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