Modifyit
New Member
I recently installed a new heat exchanger in my Burnham boiler due to corroded and leaking coil mounting plate. In chasing what seems to be excess air in the system. I have found that the B & G Flow control valve could be part of the problem. With boiler at approximately 180 degree temperature and system calling for heat, temperatrure reading with a laser gage shows very close to the expected temperature on the body of the flow control valve. However, the temperature on the outfeed side reads just barely past 110 degrees. Setting the flow control to open setting or control setting, there is no change in the above results. I have no idea what is inside this valve, but I am beginning to believe there is a major breakdown of components. Perhaps junk in the valve is reducing the flow which is affecting temperature control and volume of water moving throughout the system. This flow control valve is more than 20 years old. Just wondering if a rebuild kit would make a substantial difference.