How is the rated flow coefficient determined for pneumatic control valves?
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This post was last edited by gewensheng1987 on 2011-1-3 at 18:16. Due to the aging of the production system, some data is unavailable. Now, pneumatic control valves need to be used for the ammonia gas pipelines. The known parameters are as follows: normal production flow rate of 1000 cubic meters per hour, pressure before the valve of 0.123 Mpa, and temperature of 15 degrees. It is desired that the normal opening degree of the control valve be 60%. The diameter of the pipeline is 133 mm. Could someone help me calculate the rated flow coefficient? What diameter should the control valve have? The pressure behind the valve is 0.1 Mpa
Upstairs, the rated value of 100% Cv for a valve isn’t calculated; it’s provided by the manufacturer of the control valve. What is calculated is merely the Cv value derived from the parameters; we call it Calculated Cv. The parameters you provided are not sufficient to determine the Cv value; it is also necessary to provide the pressure behind the valve. Without this information, it’s impossible to proceed – at the very least, it’s impossible to determine what the minimum diameter that can be used is.
This diameter is usually 150; it’s just that the pressure after the valve is unknown, so it’s not possible to calculate your CV value, which makes it difficult to choose the appropriate valve type! ! The caliber can be chosen! ! If the right valve type is not selected, the requirements cannot be met, which will lead to some unnecessary problems