Rain Bird PEB flow control

Discussion in 'Irrigation' started by mrsteve, Jun 27, 2012.

  1. mrsteve

    mrsteve LawnSite Member
    Posts: 158

    I was checking a property today that has high pressure and decided to try and regulate it with the flow control on the master valve. First I took a reading (all dynamic) at a spray head near the higher elevation of the system, it was 72psi. Then took another station that was slightly smaller in gallons and lower in elevation, it was 80psi. With the gauge still connected I started to turn down the flow control on the master, all the time checking the pressure. I had to go down to where I was only about one turn from closed to make a reduction. The head that was 80 is now 50, and the head that was 72 is now 40. I didn't want to go any lower because I have two rotor sections. It seems to work, the valve wasn't hissing nor did it snap close. What are the concerns with this approach to reducing pressure?
     
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,003

    cheapsh!t way to operate when a module added to the valve gets you true regulation
     
  3. greenmonster304

    greenmonster304 LawnSite Gold Member
    Posts: 3,049

    This module is only like $40.
    Posted via Mobile Device
     
  4. mrsteve

    mrsteve LawnSite Member
    Posts: 158

    I'm listening. What do I gain? I've got a regulator on a zone valve and wonder what's the difference. Tell me why and I'll put a prs dial on this master. Especially if it is going to damage something. Even with the dial you are closing the flow way down.
     
  5. irritation

    irritation LawnSite Gold Member
    Posts: 3,200

    I find temperature and humidity both effect how flow control works. Same with using the screw on spray nozzles.
     
  6. Duekster

    Duekster LawnSite Fanatic
    from DFW, TX
    Posts: 7,961

    That is a pretty good valve. Flow control is not pressure controll however.
    Work off the furthest run first then balance the rest at the station valve.

    Best you can do with what is at hand but you could recommend pressure compensation.

    If you ask here you will get more of the same type of advice from all concerned.
     
  7. Duekster

    Duekster LawnSite Fanatic
    from DFW, TX
    Posts: 7,961

    Still better would be at the head regulation. :rolleyes:
     
  8. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,795

    Not to mention what phase the moon is in.
     
  9. Duekster

    Duekster LawnSite Fanatic
    from DFW, TX
    Posts: 7,961

    That is your period... :laugh:
     
  10. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,003

    not when the head gets more pressure than the body and cap are rated for - knock it down at the master valve first
     

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