The positive crankcase ventilation valve and gas caps with air-pollution control valves reduce volatile organic compound loss.

曲柄轴箱通风阀和配有废气帽的空气污染控制阀(的使用)对减少挥发性有机混合物释放有积极作用。

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For ventilation of pumps the valve should be mounted adjacent to the pump outlet.

对于泵通风阀应安装毗邻泵出口。

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For system ventilation the valve should be mounted at the system's highest point.

对于系统通风阀应安装在系统的最高点。

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