What is a Type CA device?
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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Uncontrolled if downloaded. This is informative, non-statutory guidance and intended for general guidance purposes only; it is subject to change.
Compliance with this information should not be relied upon as guaranteeing no enforcement action will be taken by water undertakers. Water Regs UK accepts no liability for loss, indirect or consequential loss arising from or in connection with this guidance document.