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Flow Check with Taco Zone Valves?

NCM
NCM Member Posts: 4
in THE MAIN WALL
We are adding a new zone to an existing forced hot water system. There is a 007 circulator on the return side and a flow check on the supply. We were planning on adding 2 Taco Zone valves, 1 for the existing zone and one for the addition. Are there any advantages or disadvantages to taking out the flow check on the supply side? 2 of us think it should stay but our "Boss" thinks we don't need it??? Any help would be appreciated. Thanks.

Comments

  • NCM
    NCM Member Posts: 4


    We are adding a new zone to an existing forced hot water system. There is a 007 circulator on the return side and a flow check on the supply. We were planning on adding 2 Taco Zone valves, 1 for the existing zone and one for the addition. Are there any advantages or disadvantages to taking out the flow check on the supply side? 2 of us think it should stay but our "Boss" thinks we don't need it??? Any help would be appreciated. Thanks.
  • NCM
    NCM Member Posts: 4


    We are adding a new zone to an existing forced hot water system. There is a 007 circulator on the return side and a flow check on the supply. We were planning on adding 2 Taco Zone valves, 1 for the existing zone and one for the addition. Are there any advantages or disadvantages to taking out the flow check on the supply side? 2 of us think it should stay but our "Boss" thinks we don't need it??? Any help would be appreciated. Thanks.
  • NCM
    NCM Member Posts: 4


    We are adding a new zone to an existing forced hot water system. There is a 007 circulator on the return side and a flow check on the supply. We were planning on adding 2 Taco Zone valves, 1 for the existing zone and one for the addition. Are there any advantages or disadvantages to taking out the flow check on the supply side? 2 of us think it should stay but our "Boss" thinks we don't need it??? Any help would be appreciated. Thanks.
  • Mark Hunt
    Mark Hunt Member Posts: 4,908
    You don't need it


    and it could cause flow issues if it is left there.

    Mark H

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  • Ron Schroeder_3
    Ron Schroeder_3 Member Posts: 254


    It depends, with a zone valve on one end of each zone, you "might" need a flo-check on the orher end of each zone. You don't need a flow check on any common piping unless you have an indirect as another zone.

    Ron
  • hr
    hr Member Posts: 6,106
    In some instances

    you do need flow check protection on supply and return. The ZVs will cover one side. It is possible to get ghost flow in a zone when only one side is protected.

    I like to use zone valves in conjunction with a Grundfos Super Brute with it's intergral check. no additional "devices" to plumb, and the price is the same as their "unchecked" circs.


    If all the piping take offs are vertically from the boiler piping this REALLY invites ghost flow. Always connect your take offs from the side or bottom of horizontal runs.

    Some installers prefer a thermal drop to additional flow check devices. Usually a drop of 18- 24" will be enough. Less flow restriction with a thermal drop compared to flow or spring check devices. Less noise potential also :)

    hot rod

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