Hi shiny
I don't understand your model properly.
But your observation is correct spring may try to push nozzle in upward direction.
Try to set spring manually so that in sustain condition nozzle take very little vertical load.
Spring is a very good toll if you properly manually select it to manage nozzle load.
Like Khalid mention before if in same line sometimes flow liquide & sometime gas flow be careful about upward load for spring design ( when gas flow in line). For nozzle also upward load could be problem.
There are some limitation for spring also it require maintenance, costly, Crete problem for vibrating equipment.

Hi Rk

Spring kept under locked condition for hydro test condition not for sustain. Sustain load we check when plant is running so can not lock spring.

Regards

Habib