TRV's for one-pipe steam?

Jason_44

I have Honeywell-Braukmann TRV's on my 1-pipe radiators upstairs, but a couple of them gurgle and spit quite a bit and I have a feeling that some of condensate is getting trapped inside. One of them is also connected to the radiator via a 90-deg elbow because of space constraints (some of those TRV's can be kinda big) and that one makes the most noise.

Should I be looking at a different brand? I know about Danfoss and this one...

http://www.maconcontrols.com/opsk1204.html

Any others I should be thinking about?

Thanks.

SG

Mad Dog_2

TRVS should be the cherry on the proverbial sundae

if steam quality is poor (wet)....these trvs - any any other vents and things will be destroyed in short order. Mad Dog. I never used Honeywell, but I sure they are good quality. We use Tunstall and in the past Danfoss - both excellent. Mad Dog

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Brad White_191

Listen to Mad Dog

Wet steam will defeat the best valves.

Dittoes on Macon OPSK valves (Tunstall) among others. High quality.

Jason_44

Well, I just had the boiler re-piped (new drop header, equalizer, etc. etc.), and by all indications the steam is now nice and dry.

Perhaps my prior wet steam problems are to blame? Do I need to completely replace the TRV's? Or just the air vents?

SG

Brad White_191

Now that

things are nice and dry (good for you on the re-pipe), it may be a time to get new vents (main vents and radiator vents) for a fresh start.

Worst case is that if the TRV's no longer work, you can replace them but I suspect that they will be fine, chances are. So if they are damaged, you replace them and you are done!

Steamhead (in transit)

One pipe steam TRVs

Do your Honeywell TRVs have a vacuum breaker?

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Jason_44

If they do, they're not visible.

Jason

Steamhead (in transit)

If your single-pipe steam TRVs...

...Don't have vacuum breakers, they may not work as well as those types that do.

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Brad White_203

Gordo is right.

If you do not have a vacuum breaker, having the vent isolated by the valve does not matter- the void will be filled with steam regardless. You will still over-heat.

To a lesser extent, it will not allow condensed steam to flow out of the radiator.

On the Macon OPSK's, the vacuum breaker is a separate device screwed in to the body of the valve. Very simple and effective.