You could just post a link here No need to go through the annoying step of sharing within the project itself. I will paste it here for reference.
You are currently using the automatic meshing function and I wouldn’t recommend doing so for rather complex geometries like this valve. Due the complexity, the mesh will have illegal faces as you have seen. You need to use he Hex Dominant Parametric which is inherit more difficult to learn but critical when it comes to complex geometries and obtaining optimized meshes for accuracy versus computational time.
Please refer to this project on how to setup your mesh and do let me know if you still have issues!