Abstract
A sharp increase in pressure during water hammer can lead to destruction of the pipeline. This is especially dangerous in the main water supply networks, where a large amount of liquid is transported. With indirect hydraulic shock, the increase in pressure depends on the so-called lost speed when closing the valve.Existing recommendations do not take into account the change in speed depending on the relative opening of the locking device, which in turn also depends on the time it was closed. The paper discusses the features of the effect of changes in the valve resistance during its closure on the decrease in speed in the pipeline during indirect impact. It has been shown for the first time that the increase in pressure varies depending on the closing time not according to a linear, but to a more complex power law. A specific example of calculating the increase in pressure during indirect hydraulic shock with given hydraulic flow characteristics, such as flow rate, material, diameter and wall thickness of the pipe, and also the valve closing time is given.
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