Applied to closed water circulation systems (boiler hot water, heating, central air conditioning, equipment cooling circulation), with three core functions:
1. Accommodate expanded water volume generated by water temperature rise to prevent pipeline overpressure;
2. Automatically replenish water and stabilize pressure when water loss or water volume shrinkage due to temperature drop occurs, maintaining static pressure of the system;
3. Absorb water hammer to protect water pumps, heat exchangers and valves.
