Expansion joints are only capable of protecting you from movement in the plane parallel to their axis at the expense of causing this thrust force.

In this configuration, they are only helping to protect against movement in the X and Z from being transmitted to the pump nozzles at the cost of increasing the Y load.

This results in negating the benefit of the supports above it.

Thus the solution would be to not install the expansion joints axially to the pump nozzles, but somewhere else.

Typically for this kind of piping configuration, you'd expect to see springs under the valves and not necessarily any expansion joint.

It's not exactly clear what your boundary condition is, so I won't comment on it, but the system appears incomplete to me, thus accuracy of what you have will suffer, and you can suffer from inappropriately sized spring cans.

It's generally impossible to support an elbow without some kind of welded attachment, and as such, I'd question whether or not your flexibility factors and SIFs for your bends are correct.