I am working on some modification on existing Line which is having Pressure balance Expansion joint near the turbine nozzle. The existing exp joint vendor is not tracable, but i have the exp joint specification. I have to check whether existing bellow can still be retained with the new modifcation on line.

The Exp. joint has 3 bellow elements( 2 on one side and 1 opposite),
The axial spring rate & lateral spring rate given in the spec., i suppose are for the overall exp. joint. Individual bellow element spring rate /stiffnesses are not available in the spec.

Assuming the bellow elements stiffness, same as overall exp. joint stiffness, since in that case the exp. joint would be more stiffer showing maximum loads on nozzle,
would it be correct way to model?