Backflow Device Testing and Repair

Service

Backflow Device Testing and Repair

For

Cross-connection control

Timing

Around your opening hours

Booking

By telephone

Which properties carry a device

• Premise isolation: at the water service entry of most commercial, industrial and multi-unit properties.
• Zone or fixture isolation: on boilers, fire sprinkler connections, irrigation, carbonated drink machines, chemical dispensers and similar equipment.
• Common device types: two families, the double check type (DCVA) and the reduced pressure principle type (RP), picked to suit the hazard.

What an annual test involves

1. Arrange a short water shutdown with the owner or manager.
2. Hook the differential gauge to each test cock in turn.
3. Check each valve holds and the relief opening works as designed.
4. Record readings on the test report.
5. Restore water and confirm the building has pressure.

Why devices fail a test

• Grit lodged on a check seat, common after nearby watermain repairs.
• Worn rubber parts and springs.
• A relief valve that discharges constantly, a sign something upstream needs attention.
• Frost damage on devices in unheated rooms.

Most failures are repaired with a rebuild kit on site, then re-tested the same visit.

Rules in Newmarket

• The Town of Newmarket runs a cross-connection control program for non-residential and multi-residential properties.
• Tests are to be done by a qualified tester and submitted to the Town on its schedule; check the current by-law and forms with the Town.
• New devices should follow CSA B64 series selection for the hazard involved.