CA Dunham Co Steam Traps

GaHoo

First time poster here and new to steam heat. We recently moved into an older home that uses a 2 pipe steam system from a converted coal boiler. We've noticed that around a quarter of the radiators will not heat when the boiler fires. I've read the majority of "The Lost Art of Steam Heating" and many of the articles on this site, which have been quite helpful. I think the issue with these radiators is with the return steam traps at the radiators. A few of the radiators have more modern steam traps from the 1950s by Illinois Co and Hoffman Co, which were easy to find replacement parts through Tunstall or Barnes and Jones. However, in the oldest portion of the home there are steam traps from CA Dunham Co. In the limited research I've been able to find, this was a company that started around the turn of the last century and operated independently until their merger with Bush in the 1950s. Both Tunstall and Barnes and Jones list replacement parts for Dunham-Bush Co. Does anyone know if those parts are compatible with CA Dunham co steam traps? I've attached pictures of the traps in case that would help. I'm hoping someone has already run into this issue and found a solution before I reach out to the companies that manufacture the replacement parts.
Thanks!
Matt

Jamie Hall

Tell either Dunstall or Barnes & Jones what traps you have and I'd be mightily surprised if they didn't have exactly what you need in stock.

Steamhead

Jamie Hall said:

Tell either Dunstall or Barnes & Jones what traps you have and I'd be mightily surprised if they didn't have exactly what you need in stock.

This.

Also, Dunham-Bush still exists under the name MEPCO.

nicholas bonham-carter

I would wait until winter is over, and remove one of each type of trap internals, and send them to Barnes and Jones, to be sure you get an exact replacement.
Don’t forget to look for, and check the critical crossover traps, while you are at it. Call them first to get the name of the person to whom these parts should be sent to.—NBC

Dave in QCA

The trap shown is labeled #1. I would guess that the current replacement disc for a Dunham, Dunham Bush, or Mepco 1E would also work. I see them at state supply for reasonable price.

Steamhead

Dave in QCA said:

The trap shown is labeled #1. I would guess that the current replacement disc for a Dunham, Dunham Bush, or Mepco 1E would also work. I see them at state supply for reasonable price.

Depends. We've run into some of those early #1 traps and they do not always take the same repair kits as later ones.

ethicalpaul

That's extremely cool that the label wasn't painted over 6 decades ago!

jacobsond

Ive used a few of the mepco ML9606 repair cartridge for the Dunham Bush 1E Discs when the sealing surface is pitted. The 1/2 in mostly. They make several sizes if you don't just want to replace the trap.