A Type BA, more commonly known as a reduced pressure zone or RPZ valve, is a mechanical backflow protection device. It comprises of a combination of check and relief valves in different zones which perform specific functions to ensure there is no backflow should the downstream pressure become higher than the incoming supply or the valve malfunctions.
An RPZ valve is rated by the Regulators as suitable backflow protection against both back siphonage and back pressure for contamination risks no greater than fluid category 4 .
In addition to regular inspection RPZ valves are required to undergo routine testing to verify they are working correctly. For further information about this testing as well as specific installation requirements please refer to the RPZ AIM and FAQs. Please note testing intervals will be at the discretion of the local water undertaker but not less than annually.
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