I'm wondering if the short life of the PRV's in my home plumbing is related to the sprinkler system. Unlike the previous homeowner that apparently thought he was growing corn, I only use the sprinklers during extended dry periods/drought...all of this summer unfortunately and now extending through fall. When each station first comes on the line has to be inventoried and the high flow rate results in a noisy valve chatter from the PRV as it is running out the end of its performance/flow curve--sounds like a gasoline motor firing up for several seconds.