The selection and determination of the diameter of the valve mainly based on the flow capacity of the valve, namely Cv. In various engineering instrument design and selection, it is necessary to carry out Cv calculation of the valve, and provide the valve design specifications. Then how to choose the pneumatic valve diameter?
From the Cv calculation of the regulating valve to determine the caliber of the valve, generally need to go through the following steps: 1. The current production capacity, equipment load and the condition of the medium determine the Qmax and Qmin of the calculated flow. 2. Determine the pressure difference before and after the valve. According to the selected valve flow characteristics and system characteristics select S(resistance coefficient), and then determine the calculation of differential pressure. 3. Calculate Cv. Cmax and Cmin can be obtained by selecting appropriate calculation formula and chart according to the adjusted medium. 4. Choose Cv. According to Cmax, >Cmax, which is close to level 1 C, is selected from the selected product standard series. 5, check the opening of the valve. Generally require large computation flow when opening ≯ 90%, 10% smaller when calculating traffic opening ≮. 6. Check the actual adjustable ratio of the regulating valve. Actual adjustable ≮ 10 general requirements. 7, seat diameter and nominal diameter determination. After verification, confirm according to C.
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