radiator was moved, I want to get rid of the exposed valve.

[DB]

had to move a radiator in my kitchen to install a fridge. the valve is
sticking up out of the hardwood. I have access to the steam pipe below where
the old radiator was. can I cut this and cap it?
I believe this is a one pipe system - so should this be easy for a
non-professional??

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[Bennett]

had to move a radiator in my kitchen to install a fridge.   the valve is
sticking up out of the hardwood.   I have access to the steam pipe below
where
the old radiator was.    can I cut this and cap it?
I believe this is a one pipe system - so should this be easy for a
non-professional??

I'm no expert but I think you want to go back far enough to find a
threaded fitting which can be capped. If you just cut the pipe, how
will you reliably cap it?