The pressure regulator is located at the head of the system along with the backflow prevention device; it's the gadget that controls the water pressure. If your sprinkler heads are generating more mist than spray, or if your heads or drip emitters are constantly blowing off, perhaps your regulator has gone wonky on you. Regulators usually last for decades, but if the incoming water is gritty, you may run into problems. Sometimes age takes its toll, too.
^ Attach a pressure gauge to a hose bib to test the pressure, and adjust the regulator if necessary by turning the adjustment screw (which is easy to find, ir^ll because it's the only adjustable thing on the unit). If the pressure doesn't adjust properly, purchase a rebuild kit from your local plumbing or irrigation supply store.
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