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Glycol System - Solenoid placement

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  • Glycol System - Solenoid placement

    We are in the process of building our glycol system at the moment and I have a question about placement of the solenoid valves on the supply header. Is it necessary to place them on both the cooling side and return side? Or is the cooling side enough?

    At the moment I am thinking of placing them on both supply and return lines, to prevent back flow into a jacket. Or is that not an issue? Obviously placing them solely on the supply line would be cheaper and hence my question.

    Any help would be appreciated.

  • #2
    You only need them on the supply side. When they are shut fluid can't flow in from the return side.

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    • #3
      I found this PDF pretty informative:



      First in, last out is pretty important if you want to get proper flow which is important. Wouldn't worry about back flow as long as you stick to this. Some piping configurations might need two solenoids but if you use the standard setup shown in the Diagram in the PDF, you should be fine.

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      • #4
        you need to leave your exit line open to the return header. Put a manual shutoff valve on the header for tank maintenance, but you want it open during normal use. This allows for thermal expansion of the glycol in your tank jackets during CIP. When you heat the tank up, if both the input and output are hard closed off with valves or solenoids then the glycol has no room to expand and you could damage your tank or line. I think there was another thread about this topic, where the guy was exploding his glycol drop downs during hot CIP because he was shutting both valves on the headers.

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        • #5
          Thanks guys that makes a lot of sense.

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          • #6
            Is the first in last out piping really necessary or this just an added benefit?

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            • #7
              Layout

              Originally posted by Honey Wagon View Post
              Is the first in last out piping really necessary or this just an added benefit?
              This scheme is said to help balance flow, but I can say our plant was not originally piped that way and it does ok.
              Warren Turner
              Industrial Engineering Technician
              HVACR-Electrical Systems Specialist
              Moab Brewery
              The Thought Police are Attempting to Suppress Free Speech and Sugar coat everything. This is both Cowardice and Treason given to their own kind.

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              • #8
                Double Solenoids

                2 control valves is for feeding to jackets run from 2 setpoint controls.
                They are parallel piped in that case.
                Warren Turner
                Industrial Engineering Technician
                HVACR-Electrical Systems Specialist
                Moab Brewery
                The Thought Police are Attempting to Suppress Free Speech and Sugar coat everything. This is both Cowardice and Treason given to their own kind.

                Comment


                • #9
                  Never constrict or close the return side of your jackets, unless you enjoy challenging welding projects. We have isolation valves on the return side, but I remove the handles to ensure no one accidentally closes them. Our return lines are larger than our supply lines to keep the flow unrestricted.
                  Timm Turrentine

                  Brewerywright,
                  Terminal Gravity Brewing,
                  Enterprise. Oregon.

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