I have a exspensive Moen shower valve , the kind that stops sudden water temperature changes, Worked jolly well for years then a leak appeared on one of the copper pipes leading to it ( about 2 inches away from the actual valve. I removed all the innerds out of the valve before soldering. When I soldered i wrapped cold asbestos cloth around the main valve so wouldn't over heat it. Finished the job, reassembled the valves, turned the water on and all I can get out of it is a tiny trickle of hot water. Sure would be thankful for a tip on this or do I have to go buy a new valve ? Thanks.