Canning Trial #2

I decided to get more practice with the pressure canner. I peeled and sliced up a enough carrots for a pint. I sterilized the jar, lid and ring. I put some salt and boiling water in to fill up the pint jar. I locked the lid into place and lit the burner. The pressure built up and the safety valve popped up. Now I have to let it vent for 10 minutes. I thought it was a bit too much heat so I backed off the burner. Unfortunately it was too much and the pressure dropped enough for the safety valve to drop back down. Rather than continue I decided to let it cool down and try again another time. Oh well trial and error.