Hi, I have a 100 year old house with one pipe steam system. All is well and is balanced except for one particular radiator that needs a vent with a larger throughput, hope you can help me locate one, let me explain. I'm using Maid O Mist 1/8" right angle vents.
On the second floor there is one radiator that I have placed the largest opening insert (size D), however it is not sufficient. Well in the morning when the temp goes from 66 to 70 in the house it is sufficient as the entire length of the large radiator heats and the vent closes at that point, but the room heats nicely. However, on all the incremental maintenance heat cycles throughout the day, this radiator heats but not enough when the boiler shuts off from the sensor on the first floor that says it is 70.
The problem could be solved if the radiator vent had a slightly larger throughput. The point of restriction is the 1/8" hole built into the vent, where the float moves up to seal when it gets hot. If the hole could be a little larger, then during the incremental heating during the day the radiator would get hotter. Any ideas? See pix, you can see the 1/8 " hold inside (and the screw in insert)