Regarding the Kv of the control valve?
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The flow coefficient Kv of a control valve is defined as the volume of water at a temperature of 5–40°C that passes through the valve in 1 hour under a pressure drop of 10 Pa (0.1 MPa). The formula is as follows: http://www.cntcw.com/Doc/data.WebNoteBooks/20060701202522/2-10.gif How can this formula be explained using the definition above? How are the units of each pair converted? Does Kv have a unit? What is it? I conducted simulations of the flow field inside the control valve, using water as the medium; the resulting values were flow rate Q in m³/h, pressure difference ΔP in kgf/cm², and specific weight γ in gf/cm. http://www.cntcw.com/Doc/data.WebNoteBooks/20060701203125/zs3.gif. The Kv value calculated using the above formulas differs significantly from the theoretical value. Why? ? Is it the unit that’s incorrect, or is there an issue with the calculation formula?
I’ve spent a long time trying to figure it out, but I still don’t understand it. I need it for a project I’m working on now; I would appreciate any help from those who have experience with control valves. Thank you!
I’ve also been looking into information related to control valves lately; maybe this will be helpful? http://bbs.hcbbs.com/thread-158629-1-1.html
Thank you. I’ve seen this before. Have you done any simulations? What software was used to create it? How to obtain the flow rate and pressure values?