The pressure reduction process of a pressure relief valve: the relationship between flow rate and pressure reduction ratio
Thread Content
According to the process requirements, a control valve is used to reduce the pressure of the process gas. The automatic control valve adjusts the opening degree of its valve element based on the preset pressure reduction ratio, thereby changing the CV (or KV) value of the control valve. If the pressure reduction ratio is high, the CV value of the valve will be low; in such cases, although the flow rate of gas through the control valve increases (but not beyond the speed of sound), the cross-sectional area of the valve decreases, and as a result the mass flow rate of gas also decreases. I would like to ask if anyone knows any formula that can express the relationship between the mass flow rate of gas and the pressure reduction ratio. I believe it should be represented in two stages: one where the flow velocity of the gas is relatively low as it passes through the valve, and another stage where the gas flow velocity approaches the speed of sound, at which point the flow rate no longer changes with the pressure reduction ratio
Which boss is familiar with this? Let’s discuss it!
I’m also concerned – why isn’t anyone responding?
Those in the instrumentation field, please reply!!
Everyone, please share your opinions. By the way, what is the difference between a control valve and a pressure reducing valve? Usually, control valves are used to regulate flow rate – can they also be used to adjust pressure? In terms of internal structure, what is the difference between a control valve and a pressure reducing valve?
This issue is still unresolved! Someone from the instrumentation field, please come and explain how you choose control valves Thank you!
I remember there seems to be a curve in the general product manual
Go and ask in the production technology section; maybe someone there knows.