Description
The Caleffi 521619AC 3-Way Thermo Mixing Valve is a temperature-regulating valve used in HVAC systems to blend hot and cold water streams and deliver a controlled outlet temperature. It features a 1-inch sweat connection for secure integration into copper piping networks. The three-way design allows mixing or diverting flow based on thermal conditions, maintaining stable water temperature in hydronic circuits. It is fitted in heating and cooling systems such as boilers and radiant applications where it supports consistent temperature control, assists in balancing water distribution, and ensures steady system performance during continuous operation.









