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4-way mix valves

[Deleted User]
[Deleted User] Posts: 0
in THE MAIN WALL
I am trying to find engineering material, manufacturing literature, or general guidlines in the proper sizing of four way mix valves for hydronic heating. Any information other than using .5 - 1.0" pressure drop and total flow would be appreciated.

Comments

  • Carl PE
    Carl PE Member Posts: 203
    Not Critical

    You're only using the valve to re-direct the flow, not throttle it. Doesn't matter what the Cv is.. In this case, bigger is better

    If I understand the question, that is..
  • kf_2
    kf_2 Member Posts: 118
    4-way's

    Carefull, when 4-way mixing valves are greatly oversized the actuator tends to "hunt" for the proper temperature constantly.

    Most manufacturers provide good charts to help with sizing.


    kf
  • Paul Pollets
    Paul Pollets Member Posts: 3,663
    Correct!!

    Oversizing a 4 way or 3 way has a very negative effect. I size for radiant load: 1/2" for up to 15K Btus, 3/4" from 15K-50K, 1" 50K-100K, using Viessmann valves. Sometimes, I'll use them for gravity conversions with cast iron rads, to prevent thermal shock. Sizing charts are available from the manufacturer.

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