Pressure drop
Pressure drop
(OP)
Hi,
Wanted to know if say for a flow control valve, which has a fixed upstream and downstream pressure, does the pressure drop across the control valve change with change in flow?
Wanted to know if say for a flow control valve, which has a fixed upstream and downstream pressure, does the pressure drop across the control valve change with change in flow?





RE: Pressure drop
Best regards
Morten
RE: Pressure drop
RE: Pressure drop
As for change in flowrate with a, lets used a different word, controlled up and down stream pressures, then yes the valve will be changing positions as the flowrate changes given the assumptions in the first paragraph.
deccansher, any more information on how you can get both up/down pressured fixed?
RE: Pressure drop
No, the pressure drop stays the same and the valve opening change with flow rate.
RE: Pressure drop
There are several places in a plant this might happen, but the most common would be a drain from a large vessel, or even at your home water faucet. (ignore small line losses as they would not be a significant cause of the flow change)
RE: Pressure drop
But the flow may change and the P up and P down may remain the same because the valve opening changes.
Best regards
Morten
RE: Pressure drop