The installation of an air gap and drain line are recommended.

建议安装气隙和排放管道.

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Under no circumstances, should the vent opening or drain line be plugged.

无论如何排气口不应该开启,排放管道不应该堵塞.

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Do not reduce the size of the drain line from the air gap fitting.

不要缩小从气隙连接件引出的排放管口径.

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Vent the air gap and drain line from the relief valve in accordance with code requirements.

按照规程的要求,排出安全阀气隙和排放管道的空气.

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When installing a drain line, use Series 909 air gaps on Model 909 backflow preventers.

在安装排泄管线时, 在型号909防回流阀上采用系列909气隙.

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