Places these devices live
- The water entry room of plazas, offices and apartment buildings
- Make-up water lines on boilers and hydronic loops
- Irrigation mains for lawns and planters
- Drink equipment such as carbonators and espresso machines
- Clinic, salon and car wash equipment feeds
The main assembly types
- Double check valve assembly (DCVA): two spring-loaded checks in series with test ports, used on lower-risk lines.
- Reduced pressure zone assembly (RP): a vented zone between two checks, used where the risk is higher.
- Dual checks and vacuum breakers: compact devices for one fixture or appliance.
How we run a test
- Write down the make, model, size and serial plate.
- Hook the gauge hoses to the test ports and shut the outlet valve.
- Read the differential at each check and the point where the relief opens.
- Mark the assembly pass or fail on the test sheet.
- Rebuild or replace anything that fails, then test it again.
Peel Region's program
Peel Region has a backflow prevention program under which many non-residential and multi-residential properties must have premise isolation and periodic testing, with test reports filed with the Region. Which properties are covered, and how often, is set by the Region, so check its current program or call us to talk it over.
Clues an assembly needs work
- An RP that spits water from its relief vent
- Weak pressure past the device
- Green crust or drips at the test ports
- No test sheet on file for the last twelve months
What callers want to know
Does a house need a backflow test?
Usually not, unless it has an in-ground sprinkler system with a testable device. The Region's program focuses on commercial, industrial and multi-unit properties.
What if an assembly fails?
Usually we swap the worn rubber and springs in the checks or relief valve with a rebuild kit and test again. Damaged or discontinued models get replaced.