Otherwise, such relief ( spitting) can occur when the second check is fouled during emergency backflow or resulting from a water hammer condition.

此外，在紧急回流或出现水锤现象时，如果第二止回阀受到污染，则这种安全阀可能出现释放（喷溅）。

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The time history of water hammer in pipeline in the condition of unit emergency load dump is calculated by characteristic line method.

在水电站机组丢弃负荷情况下，利用特征线法计算管道内的水击荷载时间历程。

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