I have previously drained and replaced several corroded parts of our hot water system, which uses 1920's cast iron radiators and 1-1.25" piping.
Several of the radiator valves are very old and are leaking from the stems - I am looking to replace them. I have seem similar jobs done before where the valve nut is cut with a hacksaw and released with a cold chisel, and the radiator spud is cut with a hacksaw and then folded for removal - new spud, union and valve etc.
However, the system we have does not appear to have any unions...
Any thoughts on how to replace the valves? I'm assuming I would have to replace the pipe coming out of the reducer on the radiator and add a union - then replace the valve.
Am I missing something obvious here?
(Note - this is the valve in the best condition with the least paint - the others are in bad shape)