WQD | SDW — Backflow Prevention & Cross-Connection Control
An air-gap is not a physical assembly but is instead a vertical separation between a water supply and the open vessel that it is flowing into. An air-gap must be at least twice the diameter of the supply pipe, with a minimum distance of one inch.
RP assemblies contain two independently acting check valves together with a hydraulically operating, mechanically independent pressure differential relief valve located between the check valves and below the first check valve. The unit must include test cocks and shut-off valves at each end of the assembly. This assembly type cannot be used for backflow prevention of sewage or reclaimed water.
PVB assemblies contain an independently operating check valve and an independently operating air inlet valve located on the discharge side of the check valve. The assembly must be equipped with test cocks and tightly closing shutoff valves attached at each end of the assembly.
DC assemblies contain two independently acting check valves and shutoff valves attached at each end of the assembly and fitted with test cocks
Certifications for “General” Backflow Testers and for Cross-Connection Control Program Specialists must be obtained through certifying authorities that have been approved by ADEQ.
The following organizations offer certification examinations and are approved as certifying authorities by ADEQ:
- The California-Nevada Section of the American Water Works Association (CA-NV Section AWWA)
- The American Backflow Prevention Association (ABPA)
- The American Society of Sanitary Engineers – Affiliated with the International Association of Plumbing and Mechanical Officials (ASSE – Affiliated with IAPMO)
- All American Backflow Prevention (AABP)
- Backflow “General” Tester Certifications | View >