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I am trying winterize my landscaping sprinklers. I just moved into my new house and find out this plumbing layout is quite different, I hooked up my 100psi air compressor and tried to blow them out but no luck. I can't get a hold of the old owners so I don't know what to do right now, but snow is coming soon here in Utah.

Update #1: Looks like there is no backflow prevention device.

Thanks a lot!

sprinkler1

sprinkler2

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    When you tried blowing them out did you remember to manually open the solenoid valves and close the relief valve in the manifold box? – Matthew Nov 13 '14 at 19:48
  • I have opened the solenoids for the sprinklers buy can't find the relief valve in the manifold. – Jonathan Escobedo Nov 13 '14 at 20:11
  • By the way, it's a PGV valve by Hunter. – Jonathan Escobedo Nov 13 '14 at 20:22
  • I believe the ball valve in the manifold is the relief one, so yes it's close right now. – Jonathan Escobedo Nov 13 '14 at 20:53
  • I give up on this, I believe there is a broken pipe somewhere, thanks for your help anyways. Feel free to close this question. – Jonathan Escobedo Nov 13 '14 at 22:32
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There is no need to hookup an air compressor at all, should have contacted the local city water department first. They told me that the secondary water supplier will shutoff the valves on their end and this will cause the water to drain back leaving very small amounts of water in the pipes to be blown if you really wanted to use an air compressor.

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