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Circs built-in CVs?

Tom Hopkins
Tom Hopkins Member Posts: 552
how clean the system is you install them in.

If you leave the solder flux, pipe-dope, manufacturer's thread cutting compound, surface rust, machine chips, and teflon tape fray inside - the ball and seat will "blob" up - rendering the check useless, there's a problem.

If you clean the system with TSP and thorughly rinse it afterwards, purge all air out, and prevent rust and scale build up, the checks will last longer than your pipe wrench!

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  • I know this question,,,

    has been asked before, but here it is again. Has anyone ever had a prob with those little "friction-fit" plastic & O ring built-in CVs? I`m still leery of them,,, if one ever came out it would be a nightmare to find in the piping downstream.

  • Leo
    Leo Member Posts: 770
    I've only seen

    I've only seen a couple problems but I personally don't like a part that does multiple functions. If one function goes bad the whole part get's changed. Sweat checks and iron checks have proven themselves over time. Working on oil burners the combination triple aquastat/primary control is a prime example of waste or the ignitor/primary control.

  • john_83
    john_83 Member Posts: 76

    They make replacement checks. And with valves on top and bottom of pump its a cinch to replace. As far as i'm concerned i cant even believe people are still using flow valves. A waste of good labor.
  • Rick Kelly
    Rick Kelly Member Posts: 40
    pumps w/check valves

    Those little check valves save so much time, money, and space. If your hydronic paranoia is getting the better of you, Taco and B&G will be making those CI flow checks for years, so not to worry. While your at it, add a section or two to your next cast iron boiler job. Just in case.
  • scott markle_2
    scott markle_2 Member Posts: 611
    is that a dis on iron rads?

    I agree that the built in cv's are a good thing and reduce the number of required fittings. How does this relate to the merits of CI radiation, arguably one of the finest emitters available! (although for the price you might as well go with radiant )
  • Leo
    Leo Member Posts: 770

    YOur point makes sense in a perfect world. I do mainly service and the equipment we inherit has not always been installed in a perfect world. The company I work for uses Taco wit the built in checks.
  • Leo
    Leo Member Posts: 770

    "While your at it, add a section or two to your next cast iron boiler job. Just in case."

    This statement has no bearing on the topic at hand.

  • scott markle_2
    scott markle_2 Member Posts: 611

    I guess I wasn't reading very carefully, missed the boiler part.now that I read it again I'm really confused
  • Ken_40
    Ken_40 Member Posts: 1,320
    Rick Kelly's post...

    was simply a "bustin'" comment.

    I read his implication as: if you don't believe in the simplicity and functionality of the new integrated checks, you would logically doubt everything, probably the type of person that would oversize a boiler, simply because a standing radiation count EDR calc. to properly size a boiler - would create self doubt - making it a good idea to add a few sections to the correct boiler size - simply because you do not trust the calulations, even when done properly... That kind of person would also reject built-in checks, and will doubt anything "new"...

    That's how I read it.

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  • Rich Kontny_4
    Rich Kontny_4 Member Posts: 73

  • Rich Kontny_4
    Rich Kontny_4 Member Posts: 73

  • Rich Kontny_4
    Rich Kontny_4 Member Posts: 73
    I Read It

    I read it as a very smart **** response to a very legitimate question! Those small integral pump and temperature control valve checks do indeed seem suspect.

    Not only do they appear to be a problem if debris is present, they most certainly could create flow and pressure concerns in heating and domestic water applications.

    Rick have you ever heard of Dale Carnegie??? Some research about his techniques may improve your hand grenade type responses!

    Rich Kontny
  • Thanks Ken, Leo & Rich,

    for getting things cleared up. All I did was ask a simple question (I thought), as to built-in check valves in circs,,don`t know how we got off on boiler sections, oversizing and radiation??

    Dave(The Lad)
  • Boilerpro_5
    Boilerpro_5 Member Posts: 407
    I am leary too....

    as I have had a few act up. On jobs with Indirects, I nearly always install an old flo-control valve. I simply do not want to put people at risk of scalding should the flow check valve leak. I beleive I have a bad one right now on a system that was throughly cleaned with Rhomar cleaner, flushed and refilled....will be seeing later this week. For the cost of one callback occasionally, it seems rather prudent to install conventional flow checks in many instances to prevent that call back.


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  • \" Bustin' \" comment or not , a very legit question .

    And I agree totally with Rich .

    The internal checks get hung up much easier with debris than weighted checks do . We switched to internal checks a few years ago and go back alot more frequently to jobs with heat bypass problems . So many that we're thinking of switching back to weighted checks again .

    I'm sure if we devoted more time to using cleaning agents in every install the internal check problems would disappear . But the main reason we use internal check circs is to save time , and we never needed to use cleaners before with weighted checks .
  • hot_rod
    hot_rod Member Posts: 22,120
    a simple flush

    should remove any solder balls, threading chips, dirt, etc. Add a y strainer to catch anything left behind. This should be adequate to protect the built in checks.

    I use mainly Grundfos, I don't see how that check with the stainless keeper ring could dislodge?

    But, if you are uncomfortable with the concept, weighted checks are still available.

    The vast majority of my work is new installation, the story could be different with the change-out market.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Stainless keeper ring?

    Just stocked-up on some 15-58s Friday,,I see no "SS keeper-ring" in these, is this something they just added?
    If it had this, I would be more trusting of them.

  • We're an all replacement company

    The problem is usually teflon or thread sealant sticking to the check , not a dirty existing system . Seems to be once it gets caught even a normal hot water flush don't get the gunk out of the check all of the time . I'd love to see a vertical mount weighted check . Is that new B+G version weighted or spring check ?
  • Ken_40
    Ken_40 Member Posts: 1,320

    There are no s.s retaining rings on any of my 15-58's either. Press fit, plastic friction "ears" on the "cage" - that's it.

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  • Tony_23
    Tony_23 Member Posts: 1,033
    I use

    the B&G Chek-Trol flange sets and std circs. Might not be a difference in the check style, but the circs are more universally replaceable. I don't have problems with cks getting hung up at all, maybe I'm just lucky :) Sure does save a LOT of time and money.
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