The Center Automatic Bypass Valve controls the flow of water through a bypass circuit which is installed between flow and return pipework, typically at or near the boiler. Building Regulations states that if a bypass is installed, an automatic bypass valve must be fitted. The use of an ABV is recommended by the UK Government as Best Practice in the CHeSS (Central Heating System Specifications) guide to central heating systems.
Ensures constant flow through boiler
Saves energy by only allowing flow through bypass valve when required
Reduces system noise and maintains even system pressure