Why are vents \"bad\" in two-pipe systems?

ja

Hi, I read elsewhere on this site that thermostatically venting a radiator with a steam trap is not done. Yet, they heat up very fast when a vent is used. So why are radiator vents not considered?

Also, seems to me that a second vent, at the bottom opposite the trap, would make a radiator heat even faster, now wouldn't this make it more efficient?

DanHolohan

Because

they mask bad steam traps.

Steamhead

On that type of system

the air is supposed to go into the dry (above the waterline) return, and out thru a central vent in the basement. If you put a vent on a radiator in this type of system, air will come toward it from both the steam and return sides.

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