How to calculate the pressure drop across the entire pipeline when the valve is not fully open?
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How to calculate the pressure drop across the entire pipeline when the valve is not fully open?
Measure by directly installing a pressure gauge. It seems that there’s some equivalent coefficient or equivalent straight pipe resistance in the calculations,,,,. For the variable valve opening, only measurement is available. For design purposes, one should probably consider calculating a certain parameter within the adjustment range; this is for reference only.
Go to the Piping and Valves section for more discussions
Valves have Cv/Kv curves, and by using the Cv/Kv values at different opening degrees provided by these curves, it is possible to calculate the flow resistance coefficients at those same opening degrees. The flow resistance coefficients of all components in the pipeline system are added together (including the frictional loss along the pipes), allowing for the calculation of pressure drop at a given flow rate.
Was the curve provided by the valve manufacturer?