Barnfield Valve & FittingBackflow Prevention and RPZ Valve Testing
Intended for commercial kitchens, dental practices, care homes, and garden irrigation systems requiring strict containment of contaminated fluids. We install double check valves, break tanks with air gaps, and commission reduced pressure zone (RPZ) valve devices. The testing verifies differential relief discharge and ensures compliance with South West Water regulations.
What is included
- ✓Assessment of fluid risk category across your pipe installation
- ✓Installation of cartridge-pattern double check valves (EB type)
- ✓RPZ valve (BA type) commissioning and verification
- ✓Differential pressure gauge calibration checks
- ✓Discharge tundish sizing and drainage fall alignment
- ✓Completion of local water authority test log sheets
Request a Technical Visit
We will review your inquiry and contact you to arrange a suitable inspection slot.
Questions about this service
Who requires backflow prevention valves?
Any facility with equipment connected directly to water lines that poses risk, such as commercial dishwashers, vehicle wash bays, fire sprinkler feeds, and dental chairs.
How often do RPZ valves need to be retested?
Water undertakers require RPZ valves to be tested and logged on an annual basis by an accredited commissioning technician.
Can you test standard brass double check valves?
Standard domestic double check valves do not have test cocks, but we can verify operation under backpressure or replace worn units.
Twelve-Month Fitting Guarantee
All mechanical compression joints, renewed valve bodies, and replacement cartridges installed by us carry a full twelve-month workmanship guarantee. If an installed seal, joint, or valve body we fitted weeps or malfunctions under normal use during this window, we return promptly to correct it at no additional cost. Pricing & payment
Why Property Owners Choose Us
Installation, commissioning, and test verification for Fluid Category 3, 4, and 5 devices.
Statutory compliance
Meets all legal duties under the Water Supply (Water Fittings) Regulations 1999 without enforcement notices.
Contamination barrier
Mechanically prevents non-potable liquids, chemicals, or stagnant water from siphoning back into drinking supplies.
Audit-ready paperwork
Provides dated maintenance records for environmental health, insurance auditors, and municipal inspectors.
How We Carry Out Work
-
1
Risk review
We inspect upstream draw-off points and downstream hazards to specify the correct backflow prevention device.
-
2
Installation
The valve is installed horizontally with upstream strainers, test cocks, and unrestricted air-gap tundishes.
-
3
Differential pressure test
Using calibrated three-manifold test kits, we record the opening values of both check valves and relief ports.
-
4
Compliance recording
Test certificates are issued with recorded drop pressures and serial numbers for water undertaker records.
All services
Recent Client Feedback
Fitted our stopcock neatly under the sink.
Nigel P., Exeter, GBReplaced the kitchen valve cleanly this morning.
Martin B., Exeter, GBShower dripping stopped after the replacement thermostatic valve insert was fitted, though the technician arrived twenty minutes past the morning slot.
Sarah H., Topsham, GBDiscuss Your Valve or Water Fitting Issue
Submit an outline of your plumbing valve requirements or call our office directly. We evaluate pipe sizes, schedule an on-site visit, and supply a clear fixed price before commencement.