A Type DB arrangement comprises of a pipe interrupter with a moving element (Type DB device) fitted not less than 300 mm above the spillover of any appliance or receiving vessel it supplies, discharging vertically downwards to an open outlet i.e. no method of flow control.
A Type DB arrangement is rated by the Regulators as suitable backflow protection against contamination risks no greater than fluid category 4 but for back siphonage only.
Type DB arrangements should be inspected and as necessary maintained every 12 months (BS EN 806: 5)
A DB device incorporates a moving element which closes the air inlets when the device is in use but opens to allow air if the upstream water pressure falls to atmospheric pressure.
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