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  1. #1
    Join Date
    Nov 2014
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    Philadelphia area
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    3 way diverting valves

    Might be somewhat of a novice question but i dont do much with diverting valves in heating/chilled water systems. I was installing a 3 way mixing valve for a hot water coil and i noticed a note on the instructions that said “all 3 way valves must use a normally closed actuator”. I was confused by that as i was taught all hot water coils should be piped normally open as a failsafe. Can anyone provide any insight on why the instructions would say that?

  2. #2
    Join Date
    Nov 2014
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    Philadelphia area
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    Thread Starter
    EDIT: i was installing a 3 way DIVERTING valve. Not mixing

  3. #3
    Join Date
    Feb 2016
    Location
    Louisburg Kansas
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    You were taught right. The note is wrong. It's a lot better to get too warm than to freeze a building.

  4. #4
    Join Date
    Dec 2004
    Location
    Chicago area
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    3 way diverting valves

    If they were talking about the actuator, maybe they meant spring return type.

    Where was the note? On a spec?

    Either way, fail safe to heating is best.

    Sent from my iPhone using Tapatalk

  5. #5
    Join Date
    May 2015
    Location
    CT
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    8
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    Let’s say AB is entering valve, A is going to coil and B is diverting from coil or bypass. U could still have a normally closed actuator closing off flow from AB to B leaving A to coil normally open, maybe that’s what they mean.. That’s the only thing I could come up with to as why they would say that. In my opinion, a valve manufacturer shouldn’t care unless they have to put that on there for insurance purposes lol

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