Depends upon how much pressure you have to start.
As a general guess, your heads need about 20psi to operate. What you have to do is start with the static pressure of your system and subtract all your pressure losses. If you still have about 15-30psi left, your system should be ok.
While you really need to take the time to review everything at www.irrigationtutorials.com, here's the basics.
Get a pressure guage and use a hose bibb source by your water line before any pressure regulator and read your static pressure. Start with that and here goes some estimates.
Drop 3 psi for the watermeter.
Drop 5 psi for the irrigation valves.
Drop 12-15 psi for the RPZ.
The last part is friction losses throught the pipe. Assuming everything is 3/4" Sch40 PVC, flows of 5gal/min = 5.7 psi loss per each 100 foot. 7gpm = 10.5psi/100' and 10gal/min = 20psi/100'.
So you've got to know how much water is flowing through each pipe, it's length, and do the math (so you need the gpm figures for the spray heads).
The last thing to consider is that water losses 4psi for every 10ft of elevation change.