Linear Elastic Nonequivalence Force for Dynamic Flow Balance Valve in Opening and Closing Process

In order to solve the problem that the flow rate control of a dynamic flow balance valve cannot meet the precision requirement, a dynamic model for the balance valve and the motion equation of the valve core were developed. Then, the three-dimensional flow model of the valve core with the same diameter and different diameters, both under different displacements, were solved by numerical simulation. Through comparisons in terms of the displacement error and the flow characteristic curve between the actual test and numerical simulation, the variation rule and correction factor of the linear elastic nonequivalence force were obtained, and the opening profile line was optimized. The results show that after the variable opening of the valve core is optimized by the correction factor of linear elastic nonequivalence force, the displacement error of the valve core between test and theory is reduced; the flow characteristic curve obtained by numerical simulation is consistent with the one obtained by actual test, and the flow control precision can satisfy the error requirement of less than 5%.