I realize that the steam would be blocked if there wasn't a way for the air to escape. When the pressure of the air, as the steam pressed apon it, match the pressure of the steam, the steam would not be able to go any further into the rad. Would it be correct to say that you may get 10%, 20% or...
In a single pipe steam boiler system how important is the steam valve on the radiator. If the valve was removed from the radiator and plugged would the rad still heat up, if so to what degree. The system runs at 2 or 3lbs.
DaleDe