A Type CA device is a mechanical backflow protection device. It comprises of a combination of check valves and a relief port. A disconnection is created as a result of the relief valve venting when the pressure differential across the check valves falls below 10% of the upstream pressure.
Type CA devices are rated by the Regulators as suitable backflow protection against both back siphonage and back pressure for contamination risks no greater than fluid category 3.
Type CA devices should be inspected every 6 months and as necessary maintained every 12 months (BS EN 806: 5)
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