Do you need to (and can you) disassemble quarter turn ball valves in order to safely solder them into the piping? I picked up a 1/2" valve at Home Depot. Was told there that you don't need to disassemble them. Looking through the ends it looks like there is a plastic seal that might be affected by soldering. However, based on advice I soldered one into place. It does not shut off properly with a small leak through it. I expect the heat of soldering damaged the plastic seats.
Did I just pick up a real cheap valve that should not be soldered in? Are there ball valves with seats of materials like bronze that can be soldered in place? If I have to I think I can set up of the joint soldering sequence so that the valve is disassembled, one end soldered to the fixed pipe, the other end soldered to a length of copper, the valve assembled and threaded together, then the far end of the copper pipe soldered safely away from the valve.