Abstract: To study the influence of valve core structure on throttling stop valve, the numerical simulation of flow field in the valve with flat bottom, Trapezoid and Arc valve core structure under different valve opening are computed based on finite volume method and standard k-ε turbulence model. The speed and pressure distribution in valve are analyzed. And hydraulic experimental test is carried out to obtain flow resistance characteristics. The flow coefficient and flow resistance coefficient of numerical methods basically agree with ones of hydraulic experiment. The results show that the low-pressure backflow area in valve with Trapezoid valve core and arc valve core are decreased, the pressure distribution tends to be uniform, and the flow resistance coefficient decreases when the opening is less than 40%. It is more conducive for the fluid through the valve. When the opening is more than 55%, valve flow resistance coefficient of three throttling stop valve close to zero are basically the same. For all opening, the flow of valve with Arc valve core is more uniformity and it has better control performance.

Key words: experimental test, flow coefficient, flow resistance coefficient, numerical simulation, throttle stop valve