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MP Rotators: Check Valves vs Flow Control

Discussion in 'Irrigation' started by jbell36, Oct 2, 2013.

  1. jbell36

    jbell36 LawnSite Bronze Member
    from KANSAS
    Messages: 1,397

    I know you are supposed to use the spray bodies with the check valves in them for the MP's, but I was talking to a guy who installs regular hunter spray bodies with the MP nozzles and just installs a valve with flow control on it to control pressure...does this actually work or is this completely wrong?

    I have also tried to adjust the radius on MP nozzles that were in regular spray bodies, no check valve, and they didn't seem to decrease at all...does the non check valve body have something to do with that?
  2. DanaMac

    DanaMac LawnSite Fanatic
    Messages: 13,184

    The check valve is not needed. Pressure regulating stem would be better. We still use regular heads without CV or PRS and all works fine.
  3. SoCalLandscapeMgmt

    SoCalLandscapeMgmt LawnSite Silver Member
    Messages: 2,109

    You want the bodies with the in stem pressure regulator. Both Rain Bird and Hunter sell one. You can run them without the PRS and have no issues but I find that on the Rain Bird rotary nozzles you are better off with the PRS body.
  4. ArTurf

    ArTurf LawnSite Platinum Member
    Male, from Ark
    Messages: 4,253

    Your pressure may determine if you need to use pressure regualted heads. With higher pressures it may be hard to reduce radius. If the pressure is higher I'll use regulated heads. I'm a fan of check valve heads to prevent low head drainage & wet spots.
  5. bob92553

    bob92553 LawnSite Member
    Messages: 4

    If you want to control the pressure the right way. You can buy a pressure regulator for the valve. Rainbird has one that goes in between the solenoid and the valve.
    Posted via Mobile Device
  6. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    I use checks on all heads, and PRS on most as well. The only time you wouldn't want to use a PRS would be if your nozzle pressure is already at or below your target nozzle pressure, or if you are trying to squeeze a little extra radius out of a bad design.

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