Understanding the dynamic characteristics of a check valve helps prevent an unexpected transient due to the valve’s closing behavior, and 3D computational fluid dynamics (CFD) with a moving meshing technique is a good way to represent the dynamic characteristics of a check valve. The present study aims at drawing up setting the dynamic meshing strategy to describe the dynamic behavior of the flow field within a check valve. Deforming mesh is a general approach to represent the moving boundaries in CFD, but it is not enough to describe a swing check valve’s rotating movement because it is difficult to maintain the desired mesh quality close to the moving boundary in every time step. In the present study, the pre-defined remeshing algorithm was presented to overcome the difficulties to maintain the mesh quality, a bottom-up meshing approach called Delaunay Tetra algorithm was used to get an optimized and robust mesh model. To improve the quality of the surface mesh, the interior surface was created through the moving path of the disc. The results showed that the present remeshing strategy can assure appropriate mesh validity and quality during the velve’s closing behaviour, and the numeric error caused by interpolation process of remeshing was minimized by decreasing the number of mesh re-creation.