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Manifold Advice

Discussion in 'Irrigation' started by phareous, Aug 4, 2008.

  1. phareous

    phareous LawnSite Member
    Posts: 45

    I'm a homeowner looking to build my own manifold. I've read most of the posts on here and everyone has an opinion on how to do it. Since all of you have a lot of experience in this area, can you provide any advice on how I should do it? I've read to use female-threaded valves and not have any female fittings on the manifold itself. Also I've read I should use unions to make it easier to disassemble to repair (where should I put the unions - just on the input/ouput of each valve?). And I know I need to not make it too compact (I see the Boots manifold picture posted a lot). Thanks in advance for any help
  2. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    :laugh::laugh::laugh::laugh: yes! yes! yes!!!!! :laugh::laugh::laugh:
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,685

    Naysayers!! :) Compact manifolds can be a mixed bag. Mine can be serviced. I see that Rainbird is offering a version of their DV-series valve with a female-threaded-union inlet and outlet.
  4. Waterit

    Waterit LawnSite Silver Member
    Posts: 2,906

    Tried one of those last week, had trouble with unions leaking, cut it out and went to straight PVC. No leaks.
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,685

    It probably depends on O-rings and some consistency on the male threads on the manifolds. The latter might be too much to hope for. It does seem like the union-type manifolds have a better shot, because the MPT valve inlets are probably more consistent.
  6. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,308

    Typically I build my manifolds out of SCH80 pipe & tees with SCH80 toe nipples or male adapters into the valves, with a SCH80 union on mainline. You don't necessarily have to use SCH80, I do for durability except when using crosses (cost) and on throw away fittings.

    If the valve box is large enough, I might consider using unions on the downstream piping to facilitate valve replacement. Unions on the downstream piping are easier to fit into a valve box when you use angle valves.


  7. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,976

    Nice clean manifolds, Kiril. :clapping:
  8. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,685

    Bricks?!! :dizzy:
  9. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,308

    Yes ... those manifolds are close to 18" deep. Have any other suggestions without leaving a tripping hazard on the surface or burying the box?
  10. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,976

    I've done it the same way, though the unions are a moot point without
    having them on the lateral side.

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