Design of a high-precision linear regulating ball valve

In this paper, a high-precision linear regulating ball valve is designed from four aspects: positioning accuracy, sealing performance, flow area and flow coefficient. A mathematical expression for the relationship between spool thickness, incision angle and flow coefficient was developed. The correlation matrix $P$ between the structural parameters and the flow coefficient is obtained by surface fitting. The structural parameters under linear requirements are further determined by determining the P matrix. A more accurate linearization of the flow characteristics was achieved. The CFD data showed that the error of the optimized flow rate with respect to the ideal linear data was less than 0.15 kg/s. The average error was reduced by 43.8% when compared with the minimum error of different structures. The variance decreased by about 58.2% compared to the minimum variance for different structures. The final flow test of the optimized ball valve was carried out. The error between the flow test data and the CFD data is less than 0.14 kg/s and the maximum relative error is about 6.58%.