金属的腐蚀是影响埋地钢制管道可靠性和使用寿命的关键因素之一。
The corrosion of metal is one of the critical factors that affect the reliability and the service life of buried steel pipelines.
镀锌表皮暴露在自然环境中，但它几十年来还是很好地保护了负责加热或冷却的钢制管道。
For many decades, even after being exposed to the elements, zinc galvanizing has protected your steel heating and cooling ducts.
钢制管道伸缩器可在一定范围内伸缩调节阀门与管道的连接，并能自由调节因环境温度的变化而引起的物理性伸缩。
The valve can extend and adjust the connection between valve and pipe in some range. It can also adjust physical extension freely which is caused by the change of circumstance temperature.
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