Posted by Harold Kestenholz - Hydronic Network on December 30, 2001 at 10:34:26:
In Reply to: steam radiator posted by Ron on December 29, 2001 at 15:37:16:
The valve is most likely a standard water valve that has the seat partway up in the valve body. A steam specialty valve has the seat at the bottom of the valve, so when water falls back out of a level radiator there is nothing to keep it dammed in the radiator. Replace the valve with a steam valve.