Perform an annual field test on a pressure vacuum breaker (PVB) or spill-resistant vacuum breaker (SVB) assembly
domain: Certified field tester / water purveyor · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Confirm the assembly has been under continuous pressure for the appropriate settling period before testing, per manufacturer guidance
Verify test kit calibration and connect using the PVB/SVB-specific test setup, which differs from the RP/DC hose configuration
Test the air-inlet valve opening point and the check valve closure point
Confirm the air inlet opens at or before the point the check valve fails to hold pressure, per USC test criteria
Record and submit results, flagging any assembly showing delayed air-inlet opening for repair
Known gotchas
PVB/SVB assemblies must be installed with the critical level at least 12 inches above the highest downstream outlet — a functioning assembly installed below the required critical level still fails to protect against backsiphonage
These assemblies generally cannot be used on connections under continuous pressure beyond the code-allowed duration (commonly cited as 12 hours) — confirm the connection isn't a continuously pressurized application that requires an RP instead
SVB and PVB test procedures differ slightly in bleed-valve handling; using the wrong procedure for the specific model can produce an inconclusive result
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