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This investigation focuses on the numerical analysis of the dynamic behavior of a high-pressure safety valve. A three-dimensional compressible flow model and the RNG k - Â¿ turbulence model are used to obtain the flow and thermal fields. The equations that govern the flow and heat transfer processes are solved by the finite volume method. The dynamic behavior has been presented by analyzing the complex flow which the velocity is locally supersonic and the thermal properties such as density, dynamic viscosity, and thermal conductivity of superheated steam are functions of pressure and temperature. The results show that the axial force exerted by the fluid on the valve clack first decreases with the increase of the valve opening and then increases.