Sketch parameter in equation goals

Hi,

Is it possible to use sketch parameters in equation goals?

I'm trying to find the equilibrium position of a piston and spring in a valve. As I see it it's necessary to use a 'parametric study' and define an equation goal that uses a sketch parameter - to get the this type simulation running 'fully' automated.

If anyone have some useful hints or experience please let me know....

In advance thanks for your response.

Thomas Mackeprang

SolidworksFlow Simulation