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You really should use a dielectric union. The corrosion will build up quickly especially with the zinc coating on the galvanized pipe. If don't want to use the dielectric....screw the valve on the galvanized pipe. Then you will need a male thread to copper slip adapter to screw in the other end of the valve. Then solder in your copper pipe.
I had my galvanized pipes changed to Pex Pipes best thing I ever did. Now I do not have to worry about freezing pipes.
COPPER PIPE TO THREADED STEEL PIPE
If you’ve browsed through the plumbing section at the home center, you no doubt noticed that there are threaded copper pipe fittings that you can solder right onto the end of the pipe, and they will screw directly onto older threaded galvanized water lines. So what’s the problem?
The problem is that the zinc used for galvanizing the threaded water pipes doesn’t get along very well with the copper. If you make a direct connection, these two materials will interact in a chemical reaction that will corrode the joint and eventually cause it to start leaking.
To safely connect copper and galvanized steel, you have two options. Since brass doesn’t react with either the copper or the zinc, one method is to make sure you have a threaded female end on both the copper and the steel pipes, and then connect the two by simply inserting a short threaded brass nipple between them.The second method is to use a special transition fitting called a dielectric union. The dielectric union has a threaded steel female fitting on one end, which is threaded onto the steel pipe. The other end has a female copper slip (non-threaded) fitting, which is soldered onto the copper pipe. The two halves of the joint are then connected using a lock nut and two insulating washers that prevent the copper half from contacting the steel half. The fittings cost under $10, and not only is the transition easier to accomplish, but it also leaves you with a joint in the line that can be disassembled later if you need to perform other work on the lines.