Why does the flow rate in the pipeline increase significantly when the bypass valve of the control valve is opened?
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With the control valve also fully open (no blockage), and the bypass opened, the pipe diameters before and after the pipeline remain unchanged – why then does the flow rate increase?
The control valve has a reduced diameter, so even when it is fully open, the flow rate remains limited. When the bypass line is opened, the flow rate increases significantly; with the bypass line fully open, the flow rate is at least twice that of when the bypass line is not in use.
You can take a look; the on-site control valve has a variable diameter.
If the valve does not have a reduced diameter and the flow rate through the bypass increases, then either the valve is still blocked, or the control valve itself has throttling effects (its flow capacity is lower than that of the pipeline, or in other words, it does not function like a ball valve with full bore).
Valves generally have a flow-limiting function; they are different from pipes, and this point must be kept in mind
I’m speechless at the question asked by the OP.
The bypass is open, the flow cross-sectional area increases, and the flow rate goes up – is that strange?