Automatic Sprinkler Pressure Relief Pipe?

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

  1. skytower31

    skytower31 LawnSite Member
    Posts: 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
    Posts: 18,308

    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
    Posts: 6,799

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

    sheshovel LawnSite Fanatic
    Posts: 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
    Posts: 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.
  7. 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
    Posts: 5,112

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

    1MajorTom Senior Moderator
    Posts: 6,074

    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
    Posts: 5,496

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

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