Differential Pressure Bypass valve

Kal Row

looking for a automatic Differential Pressure Bypass valve
on the system loop of a multi zone hydronic system
with 1-1/4" union connections -
any recomendations?

Unknown

Honeywell makes exactly that...

I don't have the number, though.

Noel

Kal Row

Differential Pressure Bypass valve

yes: but the DU-145 comes with 3/4 connections
my system flow is 11.7 gpm if just the smallest 1gpm
zone is on, i need to bypass 10.7gpm which is a lot
for 3/4"

Unknown

They make two sizes, and I think the bigger one is 1 1/4".

Noel

Mike T., Swampeast MO

While Honeywell, the 1¼" differential pressure bypass valve I bought a few years ago was under the "Braukman" name.

If buying from a supplier where such is uncommon get ready for strange looks and be ready to look it up yourself. Counter man kept asking, "What's it called again? What's it do? I can't find it." After about 15 minutes of this I asked to look in the book, went to the index, found "Differential Pressure Bypass Valves" listed, turned to the page and gave him the model number. Gave him the book still turned to the page headed "Differential Pressure Bypass Valves" and he AGAIN asked, "What's it called?"

JohnNY

Here's where I used two of them.
A work in progress:

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Kal Row

Differential Pressure Bypass valve

the one you are showing is the new d146 which comes
in 3/4 and 1-1/4 but is NPTxNPT 90 only
the du-145 is comes in straight union, but 3/4 only

i called the Honeywell Water Controls braukman div
and the engineer said the the D146 is all the sell
for this now.

thanks kal


ps the data sheet for this is at
http://www.honeywell.ca/braukmann/products/pdf/d146.pdf

attached is my system diagram in pdf

Kal Row

AVDO Constant Flow Control Valve

my supplier refuses to get me the braukman
- he says, it's to expensive (read - too little profit)

i found avdo25 from danfoss that has 1" union connectors, close enough -
does anyone have any experiance with it???


http://www.danfoss.ca/catalog/heating/pdf/VD.55.K6.22.pdf

Mr. Bill

AVDO

Karl go with it.

from ourstand point an extremely trouble free product to sell

Bill

Paul_11

I like Heatlink

I don't know about Danfoss, but.

I always use the Heatlink models, but then I always use Heatlink radiant materials, so that is just what I'm comfortable with. Never had a problem. They may be priced more like Brackman which is high quality as well. They come in 3/4", 1" and 1 1/4" but the flow is what is important and you would have to check their charts on the website for that.
Paul


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BillW@honeywell

New numbers

Sparco-Braukmann are now part of Honeywell water controls. We make 2 models, a D146M1032, 3/4 inch and a D146M1040 1 1/4inch. Sounds like your distributor is having a bad day...If you can tell me who he is, maybe I can help. Email me direct, not on the Wall, please.

Kal Row

picture

after a second look
i noticed your supports stands made from threaded rod into strut connectors

real cute

Einsiedler

Braukmann

D146M140 (1-1/4")
D146M132 (3/4")



EIN

hr

PAB's

are fairly simple devices I imagine any brand would be trouble free. Danfoss, Honeywell and Oventrop are brands I use.

One tip, if I may. Always put a ball valve next to one side. This allows you to purge your system without a bypass. Without isolation purging can be tricky.

hot rod

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