A single check valve is a mechanical backflow protection device. It permits water to flow from upstream to downstream but not in the reverse direction.
A single check 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 2.
Single check valves should be inspected and maintained every 12 months: non-verifiable single check valves should be replaced every 10 years (BS EN 806: 5).
There are two ways to verify the backflow protection capabilities of single check valves, both rely on satisfying a specification including performance testing. These are:
Conformity with BS EN 13959, the British Standard for both single and double checks valves, this also includes provision for fittings incorporating these devices (or equivalent).
or
Conformity with all of the tests from the Regulators Specification for fittings applicable to devices intended to be used as a single or double check valve.
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