What is the difference between a Hot water and Steam radiator valve?

I have to replace a radiator valve. I have a hot water system, but all I can find are steam valaves in the size I need. Looking at the valve, it looks pretty much the same. It seems like it would work, but it is a Steam valve. Will it work in my hot water system? Why cant I find a Hot water radiator valve over... show more I have to replace a radiator valve. I have a hot water system, but all I can find are steam valaves in the size I need. Looking at the valve, it looks pretty much the same. It seems like it would work, but it is a Steam valve. Will it work in my hot water system? Why cant I find a Hot water radiator valve over 1"?
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