Under the effect of check valve, synchronization phenomenon is caused in the process of water hammering in long distance pipelines.

由于泵站出站止回阀的作用，长输管道水击过程中会出现同步现象。

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The disc's shutoff stroke is very short and under the effect of the spring, the valve can close quickly and prevent the big noise from water-hammering.

由于阀瓣的关闭行程缩短及弹簧作用可加速关闭效果，减少水锤及水击声。

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