The Numerical Simulation And Experimental Study On Dynamic Flow Balance Valves

This paper innovatively designs a large diameter Dynamic Flow Balance Valve model with simple mechanical structure, large flow rate and high control precision, which contains a unique structure of using static pressure.The valve spool is designed according to the concentric ring slit flow theory, then numerical simulate this valve under different valve spool displacement with CFD method via standard k-ε turbulence model and SIMPLE method. Analyzing the outcome axial force&valve spool displacement curve of the valve by numerical simulation, this paper optimizes the valve structure continuously, and finally obtains a pressure&valve spool displacement curve with high linearity and verifies the usefulness of the structure of using static pressure. A linear spring is expected to use in the valve to control the spool shifts and achieve the purpose of controlling flow constant.In order to further prove the high precision of the Dynamic Flow Balance Valve, the flow rate and pressure performance of the physical model is test with specialized test platform. The flow-pressure differential characteristic curves show it is feasible to use a linear spring to achieve a constant flow rate of the valve with high precision capability. The experimental results also confirm that the CFD method is a viable and effective method to optimize the design and predictive analysis on the Dynamic Flow Balance Valve.The results of theoretical derivation and experimental research also show that the constant flow rate and working pressure scale of the control valve will change according to a certain regulation when the modulus of the spring changes, but this will have little influence on the flow rate control precision. Thus, in engineering practice, it is capable to meet the demand of different pressure scale and constant flow rate by changing the spring modulus.In this paper the designed balance valve is compared to the existing well-known balancing valves in energy consumption and the results prove that the designed valve has advantages on low energy consumption and high-flow rate characteristics. The design process of the large diameter Dynamic Flow Balance Valve is also concluded in this paper, which can provide some guidance to other series of products designing.