Eastman 60232 Sweat Ice Maker Box, 1/2-Inch

If I use a coupling female of 1/2 to screw in to the inlet, instead of solder, this with leak ??? Line inside wall is 1/4, thats way the coupling.

Can the valve be removed from the box?

1/2 sweat inlet mean what exactly? do i need bring out my blow torch, flux, and solider out?

Do you take this part when you sweat it to the pipe?