I have a question about finding a fast vent for one rad, so that I can replace a VariValve that is currently on the rad.
Here's the story:
-All other rads balanced... most have MoM #4, and all heat at the same time, quietly and evenly.
-Have wet steam... boiler installed by PO, 8 years ago. No skim port installed. Work in progress.
This one radiator, in the master bedroom of course, is always the last to heat... the line leading to this rad was rerouted during a previous remodel... so instead of going 10' straight up from the main in the basement, it goes over 8', up through an uninsulated exterior wall, and back 8' over to the rad. Much longer run than all the other radiators and the ONLY one in the house where the riser goes up through an exterior wall.
I've tried nice and slow venting, thinking that slow would help the steam heat the cold pipe as it went, preventing condensation and maybe actually being faster because of that. No dice.
I've tried various speeds of vents, most recently MoM #D.... still slower than all other rads.
A couple days ago, I put this old VariValve on... had it saved from when I started balancing what was left by house's PO, and with the valve 3/4 open, the rad FINALLY heats at the same time as the others... and with no water hammer.
What happens, though, as you can imagine, is there's a little bit of water spitting right before the vent closes.
After looking at the Venting Capacity Chart, I tried putting a MoM vent back on, with no orifice at all... just wide open, because it looked as though that might get me close to the same capacity. Again, no dice. Much slower than the others once again.
So, I guess, what I'm looking for is some way to vent as much as a VariValve 3/4 open, but with a float that will prevent spitting. (someday I'll get the wet steam fixed, but that's a larger project)
Attached is a picture of the state of the vent.
I welcome any thoughts/input/suggestions of how to get this puppy vented... keeping in mind I know that dry steam would be better.
P.S. Mains are extremely well vented... both legs fill in 1:45... so that's not a consideration here.