Calculation of the rated CV value for control valves
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This post was last edited by Yu Wei on 2019-5-8 10:09. As shown in the figure, how is the rated CV value calculated? What is the relationship with calculating the CV value?
I use software to do the calculations… I’ll share the software with you; if you want to know how to do it manually, it’s too complicated to explain in words – just search on Baidu……
Damn, I forgot to mention the relationship between the rated CV and the calculated CV. The rated CV is the inherent CV value of a valve; it is generally chosen to be 1.2–1.5 times greater than the maximum calculated CV value. The rated CV is an inherent property of the valve, and unless custom manufacturing is involved, each valve type from the manufacturer comes with one or several rated CV values. The calculated CV value should be compared with these rated CV values – if it matches, then the valve can be used; otherwise, it’s not suitable. . .
Now it is all calculated directly by software; calculating the CV value means obtaining a result by using relevant formulas based on the process parameters. The rated CV value refers to the flow capacity of the valve. Generally, to calculate the CV value, a certain amplification factor must be applied (this factor may vary among different valve manufacturers); thereafter, the rated CV value of the valve is determined based on the amplified data
Thank you for sharing:victory:
It’s obvious that it’s Wu Zhong’s calculation software
How are the pressure before the valve and the pressure after the valve determined in the parameter table? It can be estimated roughly – for example, the pressure before the valve is generally the pressure at the pump outlet. As for how to determine the pressure after the valve, it’s not clear; how should this pressure be understood?
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