Replacing old modulating valves

SeanBeans

I have a system where a number of the B&B valves are leaking from the stem.

I read the article in the library on the Bishop & Babcock system and it states that they are a packless valve.

What are my replacement options? Would like to stay with a modulating valve like what is there now but I know that may not be possible.

Attached a photo of the valve. I’m not sure I have a full photo

Jamie Hall

I suspect that a Hoffman 185C might be a decent replacement if you can't get those to stop leaking. Trouble is, they aren't cheap.

SeanBeans

I would like them to to stop leaking, problem is I don’t know how. Never ran into a packless valve.

Looks like the 185c is what I need, thanks.

Steamhead

How about these?

http://www.mepcollc.com/product-steam-specialties-regulating-valves-SWRF-B-Regulator.html

Bio

Or these?

http://www.marsh-steam.com/pdf/radiator_valves_R105_200-5.pdf

Jolly Bodger

Reading the Lit it looks like they used a bellows to seal the stem. my guess is this is cracked. Parts probably not available. You would have to take one apart but I wonder if a machine shop could grove it for an o-ring on the stem.

Gordo

@SeanBeans : You might want to consider getting a "MAC-RSBB 75-VA" Bishop & Babcock valve rebuild kit from Tunstall. You essentially remove the guts of the valve and thread in their kit. No, it might not have that early 20th century charm, but it will fix the leak and allow a TRV actuator to be installed should you so chose. It will also allow you to fix the leak without disconnecting the radiator and removing the old spud, which can be a plus.

Dave in QCA

I have successfully cleaned up an old packless valve several years ago. It worked very roughly, bound up, got stuck, etc. All I did was remove the top of the valve body and disassemble the parts. I cleaned lime residue with Limeaway and 0000 steal wool. After thoroughly rinsing and drying, I put a small amount of high temperature grease on the mating seal parts and the stem threads. When I reassemble it, it worked great. I installed it on a hot water system and had no leaks whatsoever.