I'm new to FloXpress and Flow Simulation and I'm trying to simulated the spraying pattern (full cone) of a spray tip, but I've to add lids for in- and outlet, so I can't see the spraying pattern and that's the most important. I can only see the liquid flow inside the nozzle. Is't possible to simulate a water spurt completely through my model and see the outcome; the spraying pattern?
Not in that way, no. The calculation domain resides "between" your boundary conditions, simulation will not show you what's going on outside the BC's.
You can try to add a larger open "chamber" that the nozzle spray into, and then inject particles in the fluid. I'm not sure that would work satisfactory though.
A simple flow simulation of sprayer....... and the spraying pattern