For most homeowners the test is the only time anyone looks closely at the device. It is mostly gauge work: the tester is checking whether each valve holds a pressure difference, not opening the assembly up unless something fails.
Water downstream of the device is off for part of the visit. At a house that usually means the sprinklers; at a business on an RP serving the whole building it can mean every tap, so plan the timing.
The test, in order
Confirm the device
The tester checks type, brand, size and serial number against the notice so the report matches the supplier's records.
Look it over
Installation height, orientation, leaks, missing test cock caps and any obvious damage get noted before the gauge goes on.
Flush the test cocks
Each test cock is opened briefly to clear debris that could foul the gauge or the reading.
Close the downstream shutoff
This isolates the assembly so the valves can be measured without water flowing through.
Measure each valve
Hoses from a differential gauge go on specific test cocks, and the tester reads the pressure each check or relief valve holds.
Restore service
Shutoffs are reopened slowly, caps go back on and the tester checks that nothing is leaking.
Write the report
Readings, pass or fail, any repairs and the tester's certification details go on the report for the supplier.
Common field test minimums
| Device | What is measured | Commonly used minimum |
|---|---|---|
| RP | Relief valve opening point | At least 2.0 psid |
| RP | Check valve one | At least 5.0 psid |
| RP | Check valve two | Holds tight against backpressure |
| Double check | Each check valve | At least 1.0 psid |
| PVB or SVB | Air inlet opening | At least 1.0 psid |
| PVB or SVB | Check valve | At least 1.0 psid |
Getting ready for the visit
- Find the device and clear plants, mulch or stored items around it.
- Open the lid of any valve box and scoop out dirt if you can do so safely.
- Unlock any cage or enclosure, or leave the key.
- Have the notice handy with the device ID and deadline.
- Tell anyone on site that water will be off briefly.
- Ask in advance whether the tester files the report with the city.
Questions to ask at the end of the test
- Did every valve pass, and by how much margin?
- Did you see any installation issue the city may flag?
- Who submits the report, and when should I expect it to show as received?
- If it failed, what part failed and what are my options?
Common questions
Do I need to be home for the test?
Not always, if the device is outdoors and reachable. Many owners stay so they can ask questions and get the report directly.
Will the test damage my sprinklers or fixtures?
It should not. Briefly reopened lines can push a little air or sediment, so run a tap or zone afterward.
What does psid mean on my report?
Pounds per square inch differential: the pressure difference across a valve. It is what the gauge reads during the test.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.