The system features a very quiet and reliable vacuum pump to provide adjustable flows through the tank of up to 1.67 CFM.

吸入染毒系统装有噪声小且质量可靠的真空泵，使通过箱体的空气流量可调，其最高可达1.67 CFM。

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Working principle: when the internal piping and tank vacuum, atmospheric pressure will be the valve cover, air enters the system, balance the system pressure, eliminate the effect of vacuum.

工作原理：当管道和水箱内部形成真空时，大气压便会顶开阀盖，大气进入系统内部，平衡系统压力，消除真空影响。

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Field application shows that an immersible pump method is the most ideal method for the oil vacuum unloading system of rail tank wag.

实践表明，卸槽潜油泵法是火车槽车负压卸油系统改造的最理想方法。

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