"Nationwide RPZ Valve Testing & Installation Service"

RPZ Valve Testing

Reduced Pressure Zone Valves provide a cost effective method of Backflow Protection. RPZ valves require a Commissioning Test and a periodic Test by an ACCREDITED TESTER. Diamond Plumb Ltd provide a Nationwide TESTING SERVICE. The RPZ Valve is a Type BA Verifiable Backflow Preventing Device with, as the name suggests, a Reduced Pressure Zone.


RPZ valve imageRPZ valves are installed to protect "wholesome" water (ie drinkable potable ) mains water against possible contamination in Category 4 fluids. Examples of use are listed on the home page.

The RPZ valve should not be used ( with fluid Category 5 ) where there is a risk of contamination involving Human or Animal Waste, Pathogenic or Radioactive substances or Very Toxic situations. Usually Mortuary, Farm, Butchery & Slaughterhouse premises are not suitable.

RPZ Valve Installation

The Valve should be installed horizontally, above ground with the relief valve discharging downwards into a drain or safe area. It should be in a "tamper free" environment but capable of inspection and maintenance. The Valve should not be subject to flooding or freezing or near electrical equipment.

RPZ valves have been protecting water supplies in the USA for over 30 years and are now becoming widely used in the UK.

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Our address

Diamond Plumb Ltd
Cedar Lodge, Priory Lane,
Prestbury, Macclesfield.
SK10 4AE

Tel: 01625 269168
Mob: 07947 595926