Verification of the CV value of the valve
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The CV value of a valve is calculated by various manufacturers using specialized software. So, as a buyer, how can one verify whether the CV value calculated by the manufacturer is correct or appropriate during the procurement negotiations? I heard from my supervisor before that we need the ratio of the CV value to the flow rate at maximum opening, and then select a range. What does this calculation mean? Are there any relevant specifications?
Same request here,:lol:lol
Verification can only be done through testing. Some manufacturers may have conducted type tests for certain specifications, and the test reports will include flow characteristic curves that can be used for verification; however, this is not available for all specifications. Some organizations have their own flow characteristic testing facilities, which can be used for such purposes.
I seem to have misunderstood. As for how to verify whether the Cv value calculated by the manufacturer is correct, there are basic formulas available; you can plug in the process parameters yourself to carry out the calculations and verify it. The calculation software used by different manufacturers may vary, but the underlying principle remains the same
The CV value can be understood as the opening size under standard conditions. 1. Calculate the CV value based on application requirements (flow rate/drop). . . ), convert the required flow area to an \"open area under standard conditions\". 2. The rated CV value of the valve is the “opening under standard conditions” provided in the manufacturer’s data sheet, and it is based on data obtained from actual flow tests. You don’t need to verify it; it’s a test that costs money. 3. By contrast, it means comparing 1/2, with the benchmark being \"the opening under standard conditions.\" 4. Control valves: It would be great if manufacturers could provide a table showing different opening degrees and CV values.
Based on your own data table, find a CV value calculation tool online to carry out the verification; you can also ask the manufacturer to provide you with a traffic curve, and in that case verification using the CV value may not be necessary.