Pressure differential valves

mtfallsmikey

Any particular brands that work any better....and how does one go about sizing one? Going to use one on p/s piped BB. And, does this work if using manifolds?

Unknown

PD valves

I use these , and as described, sizing is not difficult.
Just install it at the end of your header.

Dave

Unknown

PD valves

I use these , and as described, sizing is not difficult.
Just install it at the end of your manifold, much easier to control system than a hand BV.

Dave

Norm Harvey

I like the B&G version over the Taco. Those are the only two I've used. I like that the B&G has its own union

hot_rod

Install 'em

with at least one isolation valve or purging can be difficult. Isolation on either side makes for easier service should debris become lodged under the seat.

If delta p circs become accepted and used the parasitic PBV will become a non issue.

hot rod

Mark Biro

Thanks for asking the question. I'd like to know, too. I don't mean to lead the thread in another direction, but I AM mystified why the two local plumbing/heating supply distributors I visited locally (Minneapolis and St. Paul) did NOT stock differential pressure bypass valves. Maybe I picked bad days for them... but when I spoke clearly and slowly -- and even explained the function of the valve -- they did not even recognize the part. :-(

I conclude:

1. The Midwest may be a hydronic backwater?

2. Wallies are VERY talented, experienced, advanced, walk on water, etc. :-) They know EVERYTHING.

3. John Siegenthaler's thick $100 magnum opus is NOT toilet reading at our local plumbing/heating supply distributors.

Anything else?

hot_rod

The Honeywell Braukman

seem to be the easiest to find in my neck of the woods. Kansas City, Chicago, etc. Find a savvy "hydronic" wholesaler and they will be a stock item.

hot rod

Derheatmeister

Caleffi

I Use the Caleffi Valves, They have a Union on it and that makes Things easy when service is Needed.

Chas_2

not alone greg

i know your pain,when i first asked about pdv at the supply hose and yes even at wallace ennais about 10 years ago know one knew what it was they all looked at me like i was a freak .Last year by chance i aksed again and went to wallace ennais and got one b&g brand everything was beautiful ,Now i go to the supply house and they say hey clammy we got this and that and i say wow and it only started asking for this stuff like 10 years ago.I just wonder if it's gonna be like 10 years more till i see pap at the supply house that's gonna be another 10 years right after they start giving away wisbro expanding tools for free then they will drop the he pex and make every one pay big bucks for all new tools oh yeah lets not forget hydro seperators that's only been about 2 years pretty funny try about 20 years behind the rest of europe in heating techilogy and of course specility parts ,just venting i still love america peace and good luck clammy

mtfallsmikey

Good replies, many thanks!

I appreciate it very much!.. during testing/startup, how does one go about adjusting the valve correctly?

Bill W@Honeywell

Honeywell's are...

The D1461032 (3/4 inch) and the D146M1040 (1 1/4 inch), with 18 gpm and 50 gpm capacity respectively. Any hydronic oriented distributor should have these, but if not they can order them, and they are quick to ship, being made in the "Peoples Republic of Rhode Island".

Paul Pollets

PBD's

I like the Oventrop PBD which comes with a chart to dial in the setting for any US pump size. Too easy!! We buy them in Wyoming (Blueline Supply). Local Seattle distributors stock some models. I also use the Danfoss PBD's. Both are compact and easy to install.

The pic shows the PBD valve and a system bypass on a gravity conversion (25 CI rads in the home). The 4 way valve gives boiler protection from thermal shock, and the system bypass gives absolute protection when using a cast iron boiler. When I did this job, the wall hung condensing boilers were not available. Oh well...



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