In this situation, as noted by HooKooDooKu, pipe size is going to be key. For example, it would not be a wise decision to use 3/4" pipe for 72 PSI. Generally, on the systems we install on city water systems, we use at least 1 1/4" and sometimes even 1 1/2" pipe. All of the systems we install with pressures above 65-70 get a pressure reducer installed just after the connection to the main water supply. It may not need to be adjusted, but in case the water pressure ever increases or you do find a problem down the line with too much pressure, you will already have the pressure reducer there. They are not that expensive, and it is cheap insurance. Also, I might suggest that you use quality valves for your system. The cheap home improvement store valves snap closed a lot faster than the quality more expensive valves, and they are more likely to create water hammer.
Tony Posey
Ridge Run Landscapes