The shunt valve (3-way) ensures that the radiator water that runs back to the boiler is always mixed to a temperature of 140–158° F (60–70° C) in order to prevent corrosion of the boiler caused by condensation.
Shunt Valve
The shunt valve (3-way) ensures that the radiator water that runs back to the boiler is always mixed to a temperature of 140–158° F (60–70° C) in order to prevent corrosion of the boiler caused by condensation.