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Sharkbites in an old cast iron radiator system
I have a gravity feed, single zone, hot water system with large cast iron radiators in a century old Victorian style house. The heat does a fine job of keeping the majority of the house warm (the house is quite leaky though). It does accumulate some air in the highest radiator, I usually have to bleed it about once a month when it's operational.
My unfinished field stone basement has a single radiator right in the middle of the room, it's about 10 feet from the boiler and it appears to have just been tapped off the main input and output lines which are running across the ceiling. There is a T-fitting on the large (~2") iron pipes which then go into half inch copper that comes down to the floor for the radiator itself. A current project requires that I move the radiator about 2 feet, it should be a relatively simple cut and rejoin job on the copper pipe but I would have to drain the entire system and then try to find a way to drain the radiator since it won't drain through the boiler (since the inlet and outlet pipes are both above it). This would also mean adding fresh water to the entire system which to my understanding is not desired if at all avoidable.
My current idea is to shut off the freshwater feed and release the pressure from the system, then cut the copper pipe and push on a sharkbite ball valve ( I would do this on both the input and output copper pipes to that radiator and deal with whatever water I get while I'm doing that). Once the radiator is isolated I can drain what I need and shorten the pipe I need to, connect it back into the other side of the ball valve and open the valve.
The current copper system is all soldered joints, I obviously can't do that with any water spilling out of the system, I can use either a sharkbite or a compression ring fitting. Is there any issue with using either of these fittings in this system? Is there any issue with using a valve in this location if it's going to be almost always opened?