Pressure difference between Bleed Valve vs Solenoid

Discussion in 'Irrigation / Sprinkler Forum' started by mattofatto, Jul 22, 2009.

  1. mattofatto

    mattofatto New Member

    Jul 22, 2009

    I set up my sprinklers so that I can run 3 rainbirds on one of my stations. It runs great when I turn the manual bleed valve. But, if I run the automatic sprinkler/solenoid valve, then I only have enough pressure to run 2 rainbirds... and they seem to be a little low pressure. What's the deal? Why do I get so much lower pressure on the automatic system?

    They are new solenoids, new controller... but they are manual to automatic conversions.

    Any ideas?
  2. BRD

    BRD New Member

    Jun 22, 2009
    irrigation contractor
    Based on the fact that you say the valve opens fully when you manually open the valve, it appears to me that for some reason the solinoid plunger may not be coming up all the way when it is electrically actuated to allow the water to exit the upper chamber at the proper rate. I'm not sure what you did to convert your valves as you say. Do you have the correct solinoid? and if you have other zones do they operate properly? Maybe you just have a stuck solinoid. Try another one, or switch with another valve.
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  4. tomm

    tomm New Member

    Feb 21, 2008
    The clock can only operate so many solenoids at once. More than likely you are exceeding the output capability of the transformer.
  5. mattofatto

    mattofatto New Member

    Jul 22, 2009
    Thanks for the responses. Here's a little more information.

    I'm only operating one station at a time, but I have 2-3 rainbirds per station.

    I was having the problem from the first day I moved into the property. I thought it was a bad solenoid, so I swapped that out.. no change. I thought it might be the controller, so I swapped that out. That fixed another problem, but not this one. I thought maybe there was something wrong with the cheap valve that was previously on that station, so I bought a nice brass one:
    Same problem.

    Here's what the whole valve looks like:

    The lower part was here previously, and I've swapped everything else out except the wiring.
  6. upper

    upper DIY Senior Member

    May 30, 2009
    Fresno, CA
    Have you taken the WHOLE old valve out and replaced with all NEW? Upper
  7. mattofatto

    mattofatto New Member

    Jul 22, 2009
    I replaced everything in the first picture.
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