Application

Applications Requiring RPZ Valves

A Reduced Pressure Zone (RPZ) Water Valve can be installed to provide protection against backflow at the point of use from a fluid category 4 risk. Fluid risk Categories are defined in Section 1 of the Regulations.

Fluid which represents a significant health hazard due to the concentration of toxic substances, including any fluid which contains:

• a. chemical, carcinogenic substances; or pesticides (including insecticides and herbicides); or
• b. environmental organisms of potential health significance.

Types of installation/appliances with Fluid Category 4 backflow risk include the following:

Multi solutions

Fire sprinkler systems using anti-freeze solutions, Primary circuits, and central heating systems, in other than a house, with design heat output greater than 45 kWh (150,000 Btu/h).

Domestic or Residential Gardens

Mini-irrigation systems without fertiliser or insecticide application, such as pop-up sprinklers or porous hoses.

Food Processing

Bottle washing apparatus, dairies, food preparation.

​Catering

Bottle washing apparatus, dishwashing machines (not for healthcare patients), potato peeling machine (pre-washed produce), refrigerating equipment.

Industrial and Commercial Installations

Brewery and distillation plant, car washing and degreasing plants, commercial clothes washing plants, excluding use for medical or healthcare items, dyeing equipment, pressurised fire-fighting systems, printing and photographic equipment, water treatment plant using other than salt.

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