Duplication of meshed object in either pre or post processing

I originally had an object, almost like a valve, that was made up of three plates that are tri-symmetric. I removed two of the plates and replace the self-contact areas with rigid planes. This was done to decrease the simulation time. However, now I want to know if there is a way to duplicate the single plate and rotate the duplications 120 and 240 degrees, into the positions of the old plates, either in the post or pre-processing so that I can generate images and videos of how the original model would have looked like.