I have an older house built in the 20's. It has a boiler with up feed hot water and no circulator. I had a shut off valve leaking on the first floor and it was replaced, when the old valve was removed there was a funny part in it, didn't get a good look at it but was told it was not important. Now I am not getting any heat to one of the radiators on the second floor. Was told I would have to adjust the downstairs valve till heat was established. Not working! Was then told I needed to rebleed the radiators, took a gallon of water out of that one, didn't help. I feel that the part taken out of the old valve, prevented water from entering that radiator until the up one filled and allowed the hot water to return to that radiator on the way down. Have been told I am crazy, but it worked before. Any ideas on what was in the old valve? Just want the system back the way it was and some heat to that room. Thank you for any ideas.