hi. i tried tonight to use the heat in my house for the first time. it is a "cape" style house, with forced hot water heat. the heat on the first floor worked fine, but the second floor never warmed up. i went downstairs by the furnace and was looking around and saw some sort of valve on the pipe that said "upstairs supply". before the valve, the pipe was too hot to touch, after it was warm, and it got progressively cooler as it got further away from it. i am not sure what this valve is, and i am going to try and post a picture of it. and help would be greatly appreciated.