I would opt for a new valve. Get a 1/4 turn ball valve. You'll have to turn the water off at the street. When I had to replace my shut off valve, the meter valve would not 100% stop the water, so I had to find a way to keep the joint area dry to solder. I opened the valve and made a swab of an old towel and clothes hanger. I threaded the swab through the valve and into the pipe. This blocked the water and prevented the steam from getting to the joint while I soldered. After the soldering was finished, I just pulled the swab out and finished the job.