The line arresters can only protect the line insulators on the tower equipped with the line arresters from lightning flash and they have no extended protective range.
线路避雷器仅能保护安装了线路避雷器的杆塔自身的线路绝缘子（串）不发生雷击闪络，无外延的雷击保护范围。
One-Way Pressure Regulating Tower is effective to protect water hammer which is caused by discontinuous water column invited by vacuum inside the pipeline.
单向调压塔是一种用于防止管道系统中产生负压，导致水柱分离再弥合的水锤防护措施。
One-Way Pressure Regulating Tower is effective to protect water hammer which is caused by discontinuous water column invited by vacuum inside the pipeline.
单向调压塔是一种用于防止管道系统中产生负压，导致水柱分离再弥合的水锤防护措施。
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