The pressure is built from this big vertical bore, coming from the bottom. In the FE model I’ve considered that the pressure is applied to the surface of the pink part until the point the sealing acts, including the region where the sealing parts (black, orange and yellow) are in contact with the pink one. I am not interested in simulating the sealing behavior, and although I know that the pressure itself will vary a bit in that region, I thought that it would be a reasonable estimation to apply it uniformly up to that point.
As for the fixed support, the pink part is screwed to this light-blue outer part via a M30 thread. I thought that it might also be reasonable to consider it completely fixed.
Do you think that the boundary conditions could be better represented? I am eager to hear your suggestions.