They attributed it to a valve closing, not unlike other occasional noises in a power plant.

他们当时认为那是阀门发出的声音，电站里偶尔会有这样的响声，没啥不对劲的。

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The space above the piston is now sealed due to the inlet valve closing and the exhaust valve having already closed.

由于进气门关闭、排气门也已关闭，现在活塞上部的空间被密封了。

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By using the dynamic mesh model in CFD software to calculate the pipe valve closing, use the characteristic method and the experiment to compare with the same model.

运用计算流体动力学(CFD)的动网格技术对管道中的阀门关闭进行了动态模拟，针对同一模型，并与特征线法及试验进行了比较。

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He said in such a situation, normal procedure would be for the contractor's crew to secure the well by closing off the huge valve sitting on the seabed known as a blowout preventer.

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