原文：
管道排空阀技术，优点：从水箱顶部安装，排空阀本身结构不存在漏水隐患；阀体安装在水箱内，利用水箱内的热水为阀体保温；管道没有冷水，开阀即是热水；上水不受排空阀开或关的限制，打开自来水即可上水，排空阀处关闭状态时，自来水可从通气口进入水箱内，使用更加方便。本实用新型技术先进、结构简单、性能稳定可靠、运行无故障、生产成本低、使用安全方便。

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译文：
Pipe emptying valve technology, the advantages: from the top tank installation, emptying valve structure itself, there is no leakage risks; valve installed in the tank, use the hot water tank insulation for the body; no cold water pipes, open valve that is hot water; Sheung Shui from evacuation valves on or off the restriction, open water can Sheung Shui, emptying valve off, water from the vent into the tank, use the more convenient. The model is technologically advanced, simple structure, stable performance, reliable, trouble-free operation, low cost, convenience and safety.