Two wire versus three wire zone valves

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SteamNow
SteamNow Posts: 107
in Thermostats and Controls

I regularly do maintenance for an apartment complex and most of the zone valves are three wire 1311 white Rogers Zone valves. I understand how to wire them so they open and close properly but what is the purpose of them? Why not just have a spring loaded two wire 1361 instead?

TLDR is there an advantage to a three wire zone valve compared to a two wire Zone valve?

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Steamnowrockford.com

Comments

  • hot_rod
    hot_rod Posts: 28,705

    Just a different design. That valve mechanism allows for a high Cv high flowrate.

    The slow close off can help eliminate water hammer that some spring return valves experience.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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