Perform an annual field test on a double check (DC) valve assembly
domain: Certified field tester / water purveyor · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm the test kit is calibrated and the gauge needle is properly zeroed before connecting
Close the appropriate shutoff valve and open test cocks in the correct sequence to check the second check valve's minimum differential
Repeat the sequence for the first check valve per the assembly manufacturer's or USC test procedure
Confirm both check valves hold at least the minimum required pressure differential specified for that assembly's listing
Record results and submit the report before the purveyor's deadline
Bleed all test hoses and fully close test cocks after completing the test so the assembly isn't left in a partially open state
Known gotchas
DC assemblies have no relief-valve indicator the way RP assemblies do, so a slowly degrading check valve can go undetected between annual tests
Test cock sequence errors are a common cause of false results — follow the exact procedure for that manufacturer's model, since sequencing can differ between models
DC assemblies are not permitted on high-health-hazard connections regardless of test outcome — a passing test doesn't retroactively make a DC the correct device where an RP was actually required
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