RPZ vs check valve

Discussion in 'Pumps and Tanks Well Forum & Blog' started by mbartosik, Mar 9, 2007.

  1. mbartosik

    mbartosik New Member

    Messages:
    23
    Since my well pump was unfortunately a little oversized (3/4HP when 1/2HP would have done), I am going to use it to drive irrigation also.

    The well is currently only used for ground source heat pump NOT drinking/house water.

    Should I use an RPZ valve ($180) to separate heat pump from irrigation or will a simple brass check valve be sufficient (my guess $30) ?
  2. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    I don't know what an RPZ valve is, and I'm not sure I understand the question. Why would you need a valve at all?

    bob...
  3. mbartosik

    mbartosik New Member

    Messages:
    23
    Rpz

    I need to stop back flow of potentially dirty water from the irrigation system into the heat pump system. So I should use at least a check valve.

    If you connect an irrigation system to a domestic water supply a check valve is not enough. In the United Kingdom they used to require an intermediate tank. In the USA an RPZ (reduced pressure zone valve) is required. It contains I think two check valves with a center chamber (zone) that can relieve pressure in case of failure of one check valve.

    Currently there is an RPZ valve between the irrigation and domestic water supply. But my well supply would be tied into the irrigation side. I am wondering if a second RPZ to protect the geothermal system from irrigation is overkill or whether an normal check valve is enough.

    Connecting the well to the domestic side is not good because the well is not tested for potatable water.

    An example of an RPZ can be found here:
    http://www.plumbingpages.com/featurepages/OverviewGrant.cfm
    Last edited: Mar 9, 2007
  4. Rancher

    Rancher Guest

    Probably a dual check valve assembly would be enough protection, that's all that's required on residential wells to city water supplies.

    Rancher
  5. speedbump

    speedbump Previous member

    Messages:
    4,540
    Location:
    Riverview, Fl.
    Here you can't connect water wells to city water in any fashion. It's frowned on heavily by the powers that be. In my opinion, the city would be contaminating the ground water not the other way around.
    bob...
  6. sammyhydro11

    sammyhydro11 Previous member

    Messages:
    709
    Location:
    Massachusetts
    Speedbump,
    its the same here in Massachusetts too.

    SAM
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