阐述了压力输水管道高点排气与虹吸利用的矛盾关系，并列举了排气问题的解决措施，提出以采用安全阀的组合排气装置解决该问题。

The solving measures for exhaust problem are listed, and the combined exhaust device using safety valve is put forward to solve this problem.

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液压安全阀安装在油罐顶部，与呼吸阀并列使用，在呼吸阀失灵时起安全作用。

Hydraulic safety valve series shall be installed on the top the center of the tank, in order to withstand the damage to the tanks caused by operating failure of breather valve.

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液压安全阀安装在油罐顶部，与呼吸阀并列使用，在呼吸阀失灵时起安全作用。

Hydraulic safety valve series shall be installed on the top the center of the tank, in order to withstand the damage to the tanks caused by operating failure of breather valve.

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