stateflow and pnuematic modeling

When i equalize some input variable to the output variable in stateflow in simulink, it estimates the output value and make it constant. Hence, my input is also become constant value.

I understood this because i implement same logic with the switch block and it works differently.

My simulink model is pneumatic model.

This is first time i ask question online, if it is necessary I can email both models.I could not find any attachment bottom here.

Thank you