Most regulations require annual testing of backflow prevention assemblies to ensure they are functioning correctly and protecting the potable water supply.
A leaking check valve prevents the DCVA from properly sealing, which allows backflow and leads to test failure.
Debris trapped in the check valve prevents it from sealing properly, which can lead to failure of the backflow preventer.
A differential pressure gauge is used to measure pressure loss and verify the proper function of backflow prevention assemblies.
A failed first check valve can cause pressure imbalance, leading to continuous discharge from the relief valve of an RPZ assembly.
Before performing a test, the shut-off valves should be closed to isolate the assembly and ensure an accurate assessment of its function.
