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Reconnected radiator in one-pipe system
I recently reconnected a ~6 foot finned radiator in a back room of our second floor unit and have been getting inconsistent heat as well as water (heavy deposits) out the valve at the end, as well as water hammer. This unit had been disconnected over 6 years ago and is fed on it's own line from the boiler. After some preliminary searches online I boiled the valve in vinegar and also confirmed the pitch on the radiator but am still experiencing the same symptoms. I've been working my way through "We Got Steam Heat" and am questioning the feed pipe design that was put in place as well as the possible need for an adjustable valve due to the overall design of the single-pipe system heating this second floor unit. In addition, I have not been able to locate a main valve on either of the feeds leaving the boiler.
Can someone weigh in on whether or not the two-elbow feed (BackRoom_1.jpg) is appropriate, as well as whether or not the valve (BackRoom_2.jpg) should be replaced with something adjustable to help balance the system as a whole? I've included a diagram of the system (SecondFloor_Steam.jpg) and can provide more detail where required. Any help is appreciated as I have been trying to get this back room heated to alleviate some cold walls in the adjoining nursery. Thanks in advance!