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Thread: Correct valve for throttling?

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  1. #1
    Engineer MichaelO's Avatar
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    Jan 2011
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    Default Correct valve for throttling?

    Hello all,

    I'm replacing my boiler. I've decided to go a supply side circulator. I'd like to add a boiler bypass. I'm having trouble identifying throttling valves. I'm not interested in the automatic type. I looked around for globe valves but, nowhere I've stopped seems to carry them (only been to hardware stores so far, not plumbing supply). I know that ball valves aren't desirable for this, for multiple reasons.


    Here are a couple of options I've found online, but, the prices seem a bit spicy:

    http://tinyurl.com/cmdfkbs
    http://tinyurl.com/d48ou55


    This seems optimal and not available:

    http://tinyurl.com/dxvx5nh


    Perhaps they are just expensive to manufacture and this is the current state of the market but, I thought I'd check in to see if someone can help me identify a cheaper source, or some product I can request from the plumbing supply and not get floored by the price.

    I'm not sure what info is helpful so, I'm including a bunch below.

    Thanks for any assistance.

    Regards,
    Mike O'

    -Boiler: Burnham PV8H3WT-TBWF
    -Configured tankless hot water coil with storage tank and circulator pump (not sure I'm describing that right)
    -Supply side circulator, single circulator pump, 2 zone valves
    -Planned plumbing bits starting at boiler (black pipe to zones, then copper, back to black pipe at return manifold): 1 1/2 to 1 1/4 reducer, LWCO, supply valve (throttling valve), union, Bypass tees in (also want a throttling valve in bypass), Tee with purge at top, ball valve (full port) 18" run, air scoop (below air scoop is tee with pressure reducing valve, check valve, shut off valve to water supply, and below tee, expansion tank) circulator pump, 12" run, flo-chek valve, manifold to zones, zones plumbed 3/4", zone valve, balancing valve (throttling valve needed here), baseboard radiators, shut off valve, return manifold, flo-chek valve, tee to boiler bypass, union, reducer, return to rear of boiler.

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Default

    This is what we used. There not water tight they just restrict the flow. Sorry my link didn't work. I'll try to find another. Got it.


    http://www.thrushco.com/img/products...4-Balancer.jpg
    John
    Last edited by johnjh2o1; 09-09-2012 at 09:42 PM.

  3. #3
    Engineer MichaelO's Avatar
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    Default

    Thank you John!

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