Abstract: Taking DN65 marine flange cast steel bellows globe valve as an example, the finite element analysis of the flow resistance coefficient in the fully open state was carried out using Flow-Simulation software, and the flow resistance coefficient and flow coefficient were then calculated, followed by the experimental verification according to the GB/T30832 standard. The results show that the two results are consistent, demonstrating the accuracy of the numerical simulation and the method. According to the flow chart, it is found that the body of the valve is the key factor affecting the flow resistance coefficient and flow coefficient. Then, the effect of the body flow structure on the medium flow was analyzed. Meanwhile, remaining the length of the valve body structure was unchanged, the structure of the valve port was optimized, and the pressure loss on both ends was reduced, which in turn greatly reduce the cut-off valve flow resistance coefficient of the marine flange cast steel corrugated pipe, and improve its flow capacity. Finally, further verification was performed by the experimental method, which is of great significance to the optimization design of the valve, especially for straight-through globe valves.

Key words: globe valve, circulation characteristics, flow resistance coefficient, discharge coefficient, optimization design, numerical simulation