Backflow arising from connections between potable (drinking) water and non-potable water can constitute a serious public health hazard.
The Water Supply (Water Fittings) Regulations 1999 for England & Wales and the Water Byelaws 2000 (Scotland) detail the rules & requirements for the installing & use of RPZ Valves as backflow prevention devices.
The local Water Supplier must approve the installation. Diamond Plumb Ltd / www.RPZValve.com can obtain the approval on behalf of the customer.
Only approved RPZ valves & fittings must be used (see list of approved valves supplied by Diamond Plumb HERE).
The RPZ valve must be serviced, tested & maintained in accordance with the Water Supplier’s requirements, usually annually.
RPZ Valves (sometimes referred to as type BA devices) can protect against backflow at the point of use from a possible contamination of fluid up to Category 4. RPZ valves should not be used in Category 5 situations, such as mortuary or embalming, commercial agricultural insecticide or fertiliser applications and reclaimed water systems.
Specific instructions relating to the INSTALLATION OF RPZ VALVES should be followed, basically: