The launch follows the publication of the revised Approved Installation Method, RPZ AIM Issue 3, while the updated guidance introduces tighter requirements for RPZ testing methods, test equipment and tester competency under the Water Supply (Water Fittings) Regulations in England and Wales and the Water Byelaws in Scotland.
"The RPZ portion of the water regulations apply to all premises connected to a mains water supply and are intended to protect potable water from contamination up to fluid risk category of level 4," explains Scott Warby, from the RPZ Tester team at Ultravalve.
According to Ultravalve, one of the most significant changes introduced under RPZ AIM Issue 3 is the introduction of a defined minimum specification for RPZ test equipment. Consequently, from 1 January 2025, testing using a single tube manometer is no longer acceptable.
Moreover, the company advises, until 1 January 2026, testers may continue to use a U-tube manometer but only where testing is carried out in accordance with Regulator Test Code Sheet TCS 1111.13 or clause 9.5.2 of BS EN 12726:2023. All RPZ test equipment must meet the new minimum specification by 1 July 2026.
To be accepted, says Ultravalve, RPZ compliance test reports must be produced using instrumentation capable of accurately measuring pressure differentials between 0.5 kPa and 34 kPa.
"Equipment must be clearly identifiable, fully calibratable and suitable for completing all elements of the periodic compliance test," says Scott.
Test equipment must also be calibrated at least annually by a UKAS-accredited calibration service and tester personnel are responsible for understanding and applying any calibration corrections to recorded results.
Furthermore, valve testers are required to revalidate their qualification every five years, typically through reassessment rather than retraining.
Ultravalve also stipulate that only individuals who are fully trained, hold a current recognised qualification and are approved or recognised by the local water undertaker should carry out on-site RPZ testing.
"These updates will improve overall standards and ensure accurate, evidence-based measurements and testing are undertaken going forward," says Jason Hill, Sales Director at Ultravalve, adding, "they also align the UK with established good practice in countries such as Australia and the USA."
In response to the revised guidance, Ultravalve has introduced the GI-DBT2 digital backflow prevention device test kit, designed to meet the minimum equipment requirements set out in RPZ AIM Issue 3.
The updated guidance has implications across a wide range of sectors, says Ultravalve, including facilities management, water utilities, food and beverage production, pharmaceuticals and general manufacturing, where RPZ valves play a critical role in protecting potable water supplies.
To this end, the company says it is providing contractors, facilities managers and end users with products and services to help meet the new requirements
More about Ultravalve RPZ testing page: www.ultravalve.co.uk/new-rpz-compliant-test-kit/
