How to calculate flow rate when there is a control valve in the pipeline?
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For a water pipeline with DN200 diameter and an DN80 control valve in the middle, how can the maximum flow rate be estimated?
The flow velocity at flow-limiting components such as valves can be very high. There are two methods for estimation: one is to use the Cv and Kv values indicated on the valve – Kv represents the flow capacity, in m3/h; the relationship between Cv and Kv is Cv = 1.167Kv. The other method involves estimation based on the pipeline, by assuming a maximum flow velocity of 3 m/s and multiplying it by the cross-sectional area of the pipeline
https://bbs.hcbbs.com/thread-317479-1-1.html, take a look at this post; pay special attention to post 16
If it is indeed necessary to know the flow rate, it is recommended to install a flow meter; water flow meters are not expensive