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Bang noises after changing Zone Valves

S2kfixit Member Posts: 1
We had issues with heating and the specialist came and changed all 6 zone valves. After that we hear bang when it turns off it makes a bang noise. This only happened after new valves are installed. Specialist does not have to time to come back as he is very busy and this issue is way down in the list.
Before the zone valve said Automag 3/4-14 and he installed Taco zone valve. don't know if that makes any difference. Any suggestions will greatly be appreciated.


  • NY_Rob
    NY_Rob Member Posts: 1,370
    edited December 2018
    There are some zone valves that will slam shut if installed backwards in regards to flow.

    How about posting a pic of the new valve?
    rick in Alaska
  • Harold
    Harold Member Posts: 249
    Did the specialist allow any air to get into the system? That could cause banging. If that has happened, you need to bleed the system from the highest locations you can get to.
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,385
    Specialist? What was the diagnosis by this expert that all 6 zone valves were bad? I'd call and tell him this is his #1 priority, or you can get it resolved and send him the bill.
  • Jim Hankinson
    Jim Hankinson Member Posts: 99
    Sounds like the zone valves are installed for direction of flow opposite to the flow of the circulator.
  • pecmsg
    pecmsg Member Posts: 4,390
    Changed the zone valve having issues and he’s too busy to resolve.
    That’s just B $
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,385
    pecmsg said:

    Changed the zone valve having issues and he’s too busy to resolve.

    That’s just B $

    He changed 6 of them...how bout that? First of all, who carries 6 zone valves on their service truck?
    pecmsgdelta T
  • NY_Rob
    NY_Rob Member Posts: 1,370

    First of all, who carries 6 zone valves on their service truck?

    A Zone Valve "specialist" :D

    STEVEusaPApecmsgRich_49delta T
    HVACNUT Member Posts: 5,479
    The old valves were probably heat actuators.
    CC company will have your back if that's how you paid. Cancel payment.
  • Zman
    Zman Member Posts: 7,496
    edited December 2018
    The old valves were these https://www.automagzonevalve.net/products.php

    If the new ones are zone sentry's, they are not directional.

    The hammering can be caused by several things. Dead heading a pump, flow checks in incorrect locations, air in pipes to name a few.

    Some pictures of the boiler, zone valves and piping would help.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • hot_rod
    hot_rod Member Posts: 20,826
    Aren't the Automag valves power close zone valves?
    They are often used on wood boiler dump zones as the open when power is off.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • rick in Alaska
    rick in Alaska Member Posts: 1,441
    Auto Mag valves are also d.c. if I remember right. But, they are a solenoid style valve, so you would think they would bang when they close.