Structural optimization of V-sector valve cores and adaptability in secondary heating networks

Abstract

We analyzed the flow characteristics of a control valve in a secondary heating network and combined the optimization of the valve core structure with a method to solve the actual control problem of the secondary heating network. First, according to the common V-sector ball valve core, another three kinds of different V-sector ball valve cores were designed, and a simulation analysis was carried out using CFD software. By comparing the influence of four different valve core opening shapes on the valve flow characteristic curve, it was found that V3 showed better equal percentage characteristics under the opening range of 50%–100%, which improved the flow control accuracy in the heating pipe network that lacked flow feedback, and the accuracy of the simulation results was verified on the test bench. Based on this, in the different branches of the heating secondary network, the opening variation range of the four valves in actual applications were determined, and the opening variation range of the V3 valve was increased by approximately 10%. The analysis results showed that controlling the proportion of the slender part in the opening shape of the spool can effectively increase the opening range of the control valve in practical applications, thereby improving the flow control accuracy of the heating secondary network and reducing the energy consumption of heating regulation.