The flow coefficient value KV of the triple-eccentric butterfly valve
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I recently designed an 18\" CLASS600 triple-eccentric butterfly valve; the diameter of the smallest part of the flow channel is approximately 395 mm, and the thickest part of the butterfly plate is 171 mm. Using fluid simulation software, the KV value obtained was 3180, under simulation conditions of water at 20°C； Import pressure: 0.35 MPa ； Outlet pressure: 0.25MPa ； But after reviewing samples from many manufacturers of triple-eccentric butterfly valves, including those from VANESSA, the KV value is generally around 7000–10000, which is a significant discrepancy from the simulated values. In the past, when using this method to simulate KV values for other types of valves, the results were quite accurate compared to the actual values; however, this time the difference is so large. I’m not sure what’s going on. Are there anyone who is familiar with this issue? Could those who have actually conducted flow coefficient tests provide the actual values for comparison?
Which software are you using for simulation?
The Flow simulation module in Solidworks
Was it calculated again later? I gave up anyway; I’d like to know the result too. We can talk about it
The simulation results should be similar; mainly, the butterfly valves of higher weight classes are thicker, which results in a lower KV value
Would it be better to use the speed entry?
The simulated KV testing is carried out by referring to the relevant standard parameters for flow coefficient testing; it is possible to use the velocity at the inlet, but in practical applications, the fluid velocity is rarely specified. Usually, only the pressure values before and after the valve are provided. Of course, in some designs, the flow velocity is restricted, and the pressure difference is determined by reversing-engineering from that flow velocity
Boss, could you teach me how to use SW to simulate KV? Are there any materials I can refer to for learning this?*
Using the flow simulation module
It feels like something isn’t right; the 18” CV 3180 is also too small. . .
The butterfly valves of model 18-600 are made too thick, which results in a very small flow area in the flow channels; as a result, their CV value is low. This is quite accurate – you can take a look at Bore’s samples; their CV values are more or less the same. As for other valve manufacturers, if their CV values are not significantly different from those of the 18-150 model, well, I’m not sure what to say