The minimum level of protection for a hose union tap in a house garden or similar domestic application is a Double Check Valve for Fluid Category 3. By default, all commercial hose union taps are Fluid Category 5. This is a recognition that in some non-domestic situations, the fluids that are at risk of being present will be a more serious health hazard.
A recent revision to the Water Supply Industry Interpretations and Advice now states that all hose union taps and hoses used in bin stores are considered to be a Fluid Category 5 risk – unless a risk assessment by the relevant water undertaker determines otherwise. This means that the default level of backflow protection required would need to be for Fluid Category 5 – by means of an air gap.
As manufacturers of products that are specifically designed to conform to the current Water Regulations, we at Arrow Valves have a solution – a compact, wall mounted unit, in a stainless steel enclosure with a small break tank to provide the Fluid Category 5 protection, and a booster pump to provide suitable pressure to the outlet.
The BTMIDI-3A (pictured) provides a flow rate of 0.3 l/s which is generally what a 1/2″ hose gun would require, which makes it perfect for bin-store wash-down. This unit can also be supplied with a GRP wall enclosure and frost protection wiring, which means that this can be installed externally, or in unheated locations.
For technical literature, datasheets and downloads, please click here. For further information, or to request a quotation, please fill in our contact form, or give us a call. We also have a series of Water Regulations Tutorials available, as well as a list of Water Authority contacts – please click here for further information.