BS EN 13079:2025

This standard BS EN 13079:2025 Devices to prevent pollution by backflow of potable water — Air gap with injector — Family A — Type D is classified in these ICS categories:

• 13.060.20 Drinking water
• 23.060.99 Other valves
• 91.140.60 Water supply systems

This document specifies the characteristics and the requirements of air gap with injector Family A, Type D for nominal flow velocity not exceeding 3 m/s. Air gaps are devices for protection of potable water in water installations from pollution by backflow. This document is applicable to air gaps in factory-assembled products and to constructed air gaps in situ and specifies requirements and methods to verify and ensure compliance with this document during normal working use. The fluid in the receiving vessel is assumed to have similar properties to the water supply. Where this is not the case, additional care or tests can be required to verify the efficacy of the solution in practical use. The AD device is intended to be used in potable water installations according to EN 806 (all parts).