Question
Dear Jim,
Approximate. 7 years ago I had my sprinkler system updated in the front yard with 3/4 plastic pipes and pop-up sprinklers along with 1/3 of the back yard.  The rest of the back yard is the old galvanize  3/4 pipes etc..  I had great water pressure,
approximate. 125-225 psi for my area.  
Approximate every 3 years I had to replace my automatic sprinkler valves in the front yard.  The manual valves in the back rarely
had to be replaced.  After the last good leak, I decided to listen
to my neighbor and I paid to have a Pressure Regulator put in.

(Watts Pressure Regulator for the outside water. 3/4 set at 65 psi by the gardeners.  The regulator has a range of 25-75 psi)

Since the water regulator was installed I do not have enough water pressure for the back galvanize pipes and even the newer pop ups in the front yard do not work as well. (I have replaced some of the heads in the front yard)
Now for my question:
Before I get rid of the new Pressure regulator so my sprinklers will work like they use to, can I safely set the regulator at 75 psi or higher?  
Or is my best best to take off the regulator and when my automatic sprinklers valves need replacing, replace them with the manual valves instead so the water pressure does not damage my valves etc.?
(I can not afford to redo my sprinkler system in my back yard
at this time.)
Thank you kindly

Answer
Hey Kay, I hope this helps. You should safely be able to run up to 100psi through your system without problems to your valves. Kick the regulator up to 75 psi. If this still doesn't do the trick, have them replace the regulator with one that can give you up to 100psi. I would deal with the regulator and get the psi dialed in, before I would start replacing valves. Let me know if I can be of anymore help. Thanks and have a great day.