This paper considers a solution to the serious problem of hydraulic maladjustment in a dynamic flow balance valve for small diameter and low-pressure drop working conditions. The pressure drop compensation coefficient revising method was proposed to optimize the profile line of the valve core variable opening area. The flow rates of the valve before and after optimization under different displacements were simulated using Computational Fluid Dynamics (CFD) methods. The flow control accuracy of the balance valve before and after the optimization is compared and analyzed to the test values. At the same time, the influence of three key parameters: spring stiffness, the shell structure of the valve core, and geometry imperfections change due to machining burrs on the surface of the valve core for flow control accuracy was discussed. The results show that flow control accuracy after optimization satisfies the requirements of 5% flow rate control. Spring stiffness, the shell structure of the valve core and machining burrs on the surface of the valve core are shown to have an influence on the flow rate of the balance valve. This is especially true for machining burrs which has a larger effect with an average error of 10.1.

本文考虑了针对小直径和低压降工作条件的动态流量平衡阀中液压失调的严重问题的解决方案。提出了一种压降补偿系数修正方法，以优化阀芯可变开口面积的轮廓线。使用计算流体动力学（CFD）方法模拟了在不同排量下优化前后阀门的流量。比较优化前后平衡阀的流量控制精度，并将其与测试值进行分析。同时，讨论了三个关键参数的影响：弹簧刚度，阀芯的壳体结构和几何缺陷，这些缺陷是由于阀芯表面上的加工毛刺而导致流量控制精度变化的结果。结果表明，优化后的流量控制精度满足5％流量控制的要求。弹簧刚度，阀芯的壳体结构以及阀芯表面的加工毛刺均对平衡阀的流量有影响。对于加工毛刺效果特别好，平均误差为10.1的情况尤其如此。