The selection and determination of the regulating valve diameter is mainly based on the flow capacity of the valve, ie Cv. From the calculation of the Cv of the regulating valve to the determination of the diameter of the valve, the following steps are generally required:

1. Calculate the flow rate. The existing production capacity, equipment load and the condition of the medium determine the Qmax and Qmin of the calculated flow.

2. Determination of the differential pressure before and after the valve. S (resistance coefficient) is selected according to the selected valve flow characteristics and system characteristics, and then the calculated differential pressure is determined.

3. Calculate Cv. Select the appropriate calculation formula and chart according to the adjusted medium to find Cmax and Cmin

4. Use Cv. According to Cmax, select >Cmax and the closest Cv in the selected product standard series

5. Check the valve opening degree. Generally, the opening degree of the maximum calculation flow rate is ≯90%, and the opening degree when calculating the minimum flow rate is 10%.

6. Check the actual adjustable ratio of the regulating valve. General requirements for actual adjustable ratio ≮10

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Tags: Qmax flow characteristics Cv calculation flow opening

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