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No MV control with Hunter X-Core controller

Discussion in 'Irrigation' started by jcom, Sep 22, 2012.

  1. jcom

    jcom LawnSite Senior Member
    Messages: 791

    Yep, half the zones are in a remote area and served by 1" poly and the reason I don't want pressure until controller opens valve. Half zones are close to the house and served by PVC.

  2. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,094

    that makes sense to me now.
    Posted via Mobile Device
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,246

    To some degree you are trusting that the valves you installed are always going to open when you want them to, but this is true of a lot of poly mainline installs.
  4. AI Inc

    AI Inc LawnSite Fanatic
    Messages: 26,607

    Dosnt to me, no need to use a MV just cause of polly.
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,246

    I'd rather install the master valve than to trust otherwise-reliable utility-grade poly with 24/7 street pressure.
  6. jcom

    jcom LawnSite Senior Member
    Messages: 791

    Precisely Badger Man
  7. CAPT Stream Rotar

    CAPT Stream Rotar LawnSite Fanatic
    Messages: 6,130

    make your polly fittings right, know your working pressure...

    we have hundreds of poly mains with no MV...no leaks yet.
  8. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,246

    When the pressure is 24/7, things can change. Water hammer from closing zone valves is reason enough for a master valve upstream of poly mains, but there is something further that may only happen with some tubing, when the pressure is 24/7. I use mostly Oil Creek and Charter brands of non-NSF 100-psi tubing, which is the modern high-density material and all-virgin poly resin, (even though utility-grade poly tubing, by its not being NSF-rated, could contain remelted material)

    If I do have a poly mainline under 24/7 pressure, like when there are hose bibs tied in, that mainline will only be NSF-rated tubing, at a pressure rating well beyond the static pressure in the system. No worries so far. On a master-valve-fed poly mainline, I can use the ordinary utility-grade poly, and probably save more on the mainline poly than the cost of the master valve.
  9. Mdirrigation

    Mdirrigation LawnSite Gold Member
    Messages: 3,661

    Every system we install gets a master valve , and we use all pvc . Why ? We put in a quality system , a master valve is part of that quality . We have city water pressure as high as 135 psi in some areas. ( my house is 125 before the regulator , my hose spicot is before the regulator its great) . I fix leaking poly mains weekly , I always advise that a MV be added . Or I will be back again .

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