Can the control valve selected with the same CV value be used for controlling fluids in different phase states?
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There are now chilled water and steam valves, and their calculated CV values are the same; can I use the same control valve for both? The volumetric flow capacity is the same.
If the diameter and CV value are the same, and if the requirements regarding material, pressure, as well as fillers that are suitable for use with chilled water and steam, along with cooling and insulation functions, can all be met, then the same unit can be used! However, I personally find it very difficult to meet the above requirements: one heat source and one cold source! It’s better not to skimp on this money!
Thank you! I hope everyone can share their opinions! Thank you! I hope everyone can share their opinions!
Is it the CV value or the KV value for control valves? Their definition is the volume of flow at a certain pressure drop under a standard temperature. As for the two control valves mentioned by the poster, the difference between the process medium and the operating environment temperature is too large; it is impossible to use the same type of valve in practical applications. Because in two environments that are too far apart in terms of being a “heat source” or a “cold source”, the flow capacity also differs greatly!
I think it can be used; CV and KV represent the flow capacity, and since the CV values are the same, it’s feasible to use them. But there are prerequisites: first, the material must meet the requirements; second, the diameter calculated for different phases may not be the same. If the diameters are identical or if the diameter after reduction meets the requirements, then it can be used
Don’t mislead the original poster. First, the phases are different; second, the pressure difference before and after the valve is different; third, the materials of the valves are different, and so on. How can it be used in such a situation?
The flow capacity is the same, so it can be used. When using chilled water with steam, care must be taken; the working pressures are different, and it’s difficult to adjust the control valve, making it likely that it won’t be able to be closed