@ Mr. Oertel
Thanks for the reply

If I will use tie rod, is the pressure thrust will act on the nozzle of the pump when the bellow compressed due to the expansion of the piping?
You said that the pressure thrust will act only on the inside area of the pump and the nozzle will only absorb the force from the difference of Outside and inside bellows area.

@ abdelkader
Thanks also.

I tried to model an expansion with tie rod on the nozzle, the pressure thrust was transferred and absorbed by the tie rod..the thrust force is no longer acting on the nozzle. But prior to that, I anticipated that the pressure thrust will act on the nozzle because the nozzle and piping will tend to compress the bellows and it will opposed by the pressure thrust. Can you please explain why this happened?

Regards,

Clyde