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Automatic Sprinkler Pressure Relief Pipe?

Discussion in 'Homeowner Assistance Forum' started by skytower31, Jun 28, 2007.

  1. skytower31

    skytower31 LawnSite Member
    Messages: 2

    Hi folks, just ran across this forum and hopefully someone can help me out. I have a 4 zone auto sprinkler system at my house. I recently replumbed one of the valves to a new line for some new landscaping. This valve was for an area we no longer have landscaping in. All the valves have 3/4" piping going in and out of them. Downstream of the valve in the new line I plumbed I used a reducing 90* elbow to go from 3/4" to 1/2". This new landscaped area already had a 1/2" line plumbed under the concrete walk, etc so I didn't want to redo everything with 3/4" pipe. When I tested the new line, water started coming from the ground around the input/output lines from the valves. After some digging I found an open ended pipe buried under the valve piping. Best I could figure is that it is a pressure relief pipe if there is too much pressure in the system. Anyone ever heard of this? The other 3 valves work fine and were all plumbed before we bought the house.

    Here are my quetsions:
    Is that a pressure relief pipe?
    How can I reduce from 3/4" to 1/2"?
    Do I have to completely re-run the line?

    Thanks for any help!!!
  2. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    My guess would be you cut a feed line to another part of your property, either to a remote set of values or a hose bibb.
  3. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    There is no such thing as a pressure relief pipe.

    Please dig the whole thing out good, and take a picture.

    BTW, somethings are better left done by professionals.

    Messages: 18,668

    i wish I could add to your post Jon but you covered everything so beautifully in three sentences.
  5. sheshovel

    sheshovel LawnSite Fanatic
    Messages: 5,112

    Please re-state your problem using a less roundabout explanation. You attached a 1/2" new line to the old 3/4 from the valve to going under the walk with a reducing 90. It goes out to the un-landscaped area. Now you tested the new line and water is coming out of an unknown pipe under the valve line is this correct?
  6. Mjtrole

    Mjtrole LawnSite Member
    Messages: 226

    It's possible you somehow reconnected the old line somewhere and it is simply feeding back to the valve where it used to connect.

    Messages: 18,668

    How about we let him post pics. Having a confused person restate his problem doesn't seem very productive to me.:dizzy:
  8. sheshovel

    sheshovel LawnSite Fanatic
    Messages: 5,112

    Cuz he probably does not know how to post up pics, ever thought of that?
  9. 1MajorTom

    1MajorTom Former Moderator
    Messages: 6,073

    He's never been back yet to see any of the responses. He was last here on
    6-28, 5:42pm.
  10. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    ... except on $1500/zone systems... and I'll bet they're copper or brass. :laugh:

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