Automatic Drain Valves Turn off the water supply by closing the main valve to the sprinkler system. As pressure inside the system falls, it will drain water automatically. Open the drain cap between the main valve and the backflow device. Lift each sprinkler head to drain out any residual water. Click to see full answer. Similarly one may ask, what is a self draining sprinkler system?The self draining valves drain slow so there isn’t much extra water used. They also claim the tubing they use can expand 14% and water expands 6% when it freezes, so even if the system isn’t fully drained it won’t be damaged if it freezes.Also, when should I worry about sprinkler system freezing? Sprinkler pipes and other components are at risk of freezing and breaking when temperatures drop below 32 degrees Fahrenheit. Immediate damage can occur to exposed pipes and sprinkler equipment with the first freeze of winter. Similarly, you may ask, how do you drain a Rainbird sprinkler system? Open one of the sprinkler system control valves, either manually or electrically from the controller, to relieve pressure on the sprinkler system mainline. Slowly open the manual drain valve ( B ). Repeat this procedure for all manual drain valves on the sprinkler system mainline.Do I need to drain my sprinkler system?So, if you have a lawn sprinkler, you need to winterize it before the temperatures plunge to the freezing mark. If you forget to winterize your sprinklers, you run the risk that water will freeze in the irrigation valves, pipes and sprinkler heads.
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