Your lawn sprinkler system was prepared for winter by evacuating the water from the piping and heads by means of air pressure. At Jetstream, it is our desire for your sprinkler system to operate year after year with little or no problems. The following information will help to prevent an event that occurs occasionally in sprinkler systems.
Your system has a main shut off (either a gate valve or ball valve) most often located in your basement. The closing of this valve is one of the first things we do when rendering the “blow-out” service. If the valve were not closed, water would continually fill the system as quick as it is evacuated and freeze damage would occur. Occasionally, this valve is faulty and despite closing it, it leaks water through it at an extremely slow if not imperceptible rate.
When this occurs with the sprinkler main shut off valve, water will leak back into your system and cause freeze damage. It may take a day or two or
more often, several weeks for this problem to even be noticed. Sometimes the problem is not even identified until the spring and by this time, freeze damage has occurred. Generally, the first thing you would notice is water dripping from your Pressure Vacuum Breaker (PVB), sometime after winterization. As a precaution, we leave the hose spigot on this apparatus open for this exact reason. If your main valve does leak, the water will eventually start to drip from this opening, rather than refilling your sprinkler pipes.
What should you do to minimize this possible problem?
- Make a 10 second inspection of your PVB about 5 then 14 days after we have winterized. Look for dripping water or ice build up.
- If water/ice is present, your main shut off valve is indeed faulty and will need repair or replacement…call us now to schedule this repair.
Do not be alarmed, this situation is not common, but with your help we can minimize serious problems resulting in costly repairs next spring. If you have any questions, please contact us.