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。
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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