Caleffi Adjustable differential pressure by-pass valve
The adjustable differential pressure by-pass valve ensures the head pressure of the pump is proportional to the number of two-way on/off, modulating or thermostatic valves being closed in the secondary circuit, preventing pump overheating and excessive fluid velocity.
Watts Radiant ThermalPro Mixed Boiler Stations, 7.31 Cv w 25-58 Circulator