Numerical Analysis of Contra-Push Check Valve Flow Characteristics on Local Position

When the working condition of primary pump of pressurized water reactor changes, the countercurrent of fluid can be well prevented by check valve. The water hammer phenomenon often appears in the loop during the countercurrent process. Serious water hammer not only brings incident of over pressure, and imperil pressure boundary, but also engenders the lapse of check valve. Contra-push check valve is a new kind of check valve. Its new structural design of river diversion can well reduce the water hammer phenomena, thereby enhancing the operational security of nuclear power plant. By the aid of the numerical methods, physical models, dynamic mesh model and UDF(User Define Functions) offered by FLUENT, simulation of the local irregular flow field and the pressure distribution during the process of closing the valve have been conducted more realistically. Simulation results indicate that, the change of geometry shape will cause the higher local velocity than the other regions but little affect of stability during shutdown. The analysis of results are providing a basis for future applications and reliability analysis of valve.