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What is an RPZ Valve?

A Type BA valve, more commonly known as an RPZ (Reduced Pressure Zone) valve is designed for use in commercial and industrial applications to avoid back siphonage and pollution of the potable water distribution system. We specialise in the nationwide supply, installation and testing of RPZ valves.

To meet water regulations, RPZ valves are subject to an annual test by the local water authority which can only be carried out by an accredited tester. As a WRAS approved RPZ tester, we can plan and carry out all your RPZ testing, and also liaise with your local water authority on your behalf. Our service of supply, testing and installing RPZ valves covers the whole of the UK. Please contact us for more information on how we can reduce your annual RPZ testing costs.

Who needs an RPZ Valve?

  • General
  • Fire sprinkler systems using anti-freeze solutions
  • Commercial central heating systems with design heat output >45 kW
  • Food Processing
  • Bottle washing apparatus
  • Dairies
  • Food preparation
  • Catering
  • Bottle washing apparatus
  • Commercial dishwashing machines
  • Potato peeling machines (pre-washed produce)
  • Refrigerating equipment
  • Industrial and commercial installations
  • Brewery and distillation plant
  • Car washing and degreasing plants
  • Commercial clothes washing machines
  • Dyeing equipment
  • Pressurised fire-fighting systems
  • Printing and photographic equipment
  • Water treatment plant using other than salt
  • Leisure and hotel facilities
  • Swimming pool top-up supplies

Backflow, causing cross-contamination between potable and non-potable water supplies, can constitute a serious public health hazard. RPZ valves will provide protection against this hazard.

An RPZ valve consists of two independent check valves, plumbed in series, with a pressure monitored chamber between them, forming a Reduced Pressure Zone (RPZ). They act as a backflow preventer and provide mains water protection to category 4 fluid contamination risk situations.

The valve must be installed above the floor, horizontally, with the relief valve discharging downwards. An in-line strainer should be installed upstream to prevent fouling of the assembly elements. The valve should be in a location that enables effective inspection, testing and maintenance. The valve should not be installed in concealed locations or locations liable to flooding, freezing, above electrical equipment or liable to mechanical or other damage.

RPZ Valve Testing

If your premises has an RPZ valve installed, it is a legal requirement that this be checked by an authorised tester. RPZ valves are subject to a compulsory annual test by the local water authority which can only be carried out by a WRAS accredited RPZ tester.

RPZ Valve Models Tested

We test RPZ valves from all major valve manufacturers including Honeywell, Altecnic, Nabic, Danfoss Socla, Conbraco, Reliance Water Controls and Watts Industries. All RPZ valve sizes are covered by our comprehensive supply, testing, repair and replacement service. Jackson Services Maintenance are approved suppliers of Watts RPZ valves.

Contact Us For More Information

Please e-mail us for an RPZ valve test quotation, or if you require any further information on the application of RPZ valves on your premises - we are here to help, advise, supply, install, commission, test and maintain your RPZ valves.