I.S. EN 61770:2009&A12:2022

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General conditions for the tests
6 Airgaps
7 Pipe interrupters
8 Dynamic backflow preventers
9 Hose-sets
Annex A (normative) Backsiphonage test
Figure 1 – Arrangement for the determination of "h" for pipe interrupters
Figure 2 – Arrangement for the determination of maximum and critical water levels for pipe interrupters
Figure 3 – Kinking test
Figure 4 – Arrangement for verifying the resistance of hose-sets to pulses
Figure 5 – Mandrel for testing coupling nuts
Figure 6 – Mandrel for ozone test on hose-sets
Figure 7 – Arrangement for the flexing test
Figure 8 – Arrangement for the bending test
Figure 9 – Detail for applying the bending moment to coupling tubes
Figure 10 – Detail for the impact test on coupling tubes
Table 1 – Tests applicable to different types of hoses

This European Standard specifies requirements for appliances for household and similar purposes to prevent the backflow of non-potable water into the water mains.