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。
2
Under the effect of check valve, synchronization phenomenon is caused in the process of waterhammering in long distance pipelines.