Picture above is the current setup and it has a prv (50psi) and feeds the facets and rest of house except for irrigation system. The city water pressure is >90 psi which only feeds the irrigation system.
The prv was installed last November and so the irrigation system never had a chance to be run/tested until now, and we get a series of pipe bangs around the house whenever the sprinkler valves cycle. I added an arrestor between the backflow and the valves, seems to damper the pipe banging a little but does not silent the pipes. Prior to the prv install, there was no pipe bang/hammer issue with city water pressure. Reason for PRV was for lowering pressure for showers and faucets and water heater expansion tank.
Whats the reason for pipe bangs even with water hammer? Is it due to city pressure and prv alternating the house pressure? Did we install the prv at the wrong spot? should the prv be placed after the shutoff to service all including irrigation? if we installed a second prv going to the irrigation, could this also solve the problem ?
Any responses would be greatly appreciated.