Backflow Repair Versus Complete Rebuild
A targeted repair replaces only the failed component.
A complete rebuild may replace multiple wear components throughout the assembly.
The appropriate approach depends on:
- Age
- Test results
- Condition of internal parts
- Availability of repair kits
- Cost compared with replacement
Reduced Pressure Assembly Repair
RP assemblies contain two check valves and a relief-valve zone.
Common symptoms include continuous relief discharge or failure to maintain required differential pressure.
Cleaning or replacement of internal components may restore proper operation.
DC and DCDA Repair
Double-check assemblies depend on independently operating check valves.
DCDA devices are commonly used in fire protection applications and include additional metering or bypass components.
Failed checks can often be serviced if the assembly body remains usable.
A backflow rebuild should restore the device to measurable operating performance, not simply stop an external leak.
When Replacement Is Better
Replacement may be more practical when:
- The body is cracked
- Severe corrosion is present
- Parts are obsolete
- The assembly is improperly sized
- Repeated rebuilds are no longer economical
Testing After Repair
Repaired assemblies should be tested to confirm that check valves, relief components, and required pressure differentials meet applicable standards.
Certification may then be completed when required.
Extending Backflow Equipment Life
Routine testing, prompt repairs, proper winter protection, and a protective enclosure can extend the useful life of a backflow preventer.
A professional repair or rebuild allows many devices to remain in service while maintaining the water-system protection they were originally installed to provide.
