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32


HOW PRESSURE-BALANCING MIXERS WORK Fig. 1


Figure 1 shows a ceramic cartridge where both the cold and hot water supply pressure is 3 bar, and the outlet temperature is pre-set to 41°C. If the cold water pressure drops to 2.5 bar and the hot water pressure remains at 3 bar, the higher pressure at the hot water inlet causes the shuttle to displace, restricting the hot water flow into the mixing chamber while simultaneously allowing more cold water to flow.


As a result, the mixed water at the outlet remains at 41°C (Figure 2). Similarly, if the pressure at the hot water inlet drops to 2.5 bar and the cold water pressure remains at 3 bar, the shuttle adjusts the apertures to increase the hot water and reduce cold water flow into the mixing chamber. (Figure 3).


Fig. 2 Fig.3


Taps with smooth interiors have fewer niches where bacteria can adhere, significantly slowing biofilm development. Moreover, as a preventative measure, cleaning mixers in a descaling solution will further reduce biofilm build-up. If those mixers can be removed easily, they can be regularly cleaned or disinfected if a contamination episode occurs. Advances in anti-scalding technology and infection control have led to a


multitude of products that offer different solutions for patient, staff and visitor safety in healthcare environments. Certainly the technologies are not mutually exclusive and not always complex. It is possible to control Legionella and provide scalding safety for most situations and accommodate the comparative risk levels.


Carole Armstrong is the marketing & communications manager at Delabie UK


Yeoman Shield products put an end to costly re-painting and repair.


for more information call 0113 279 5854 or email sallyann@yeomanshield.com


www.yeomanshield.com


PROTECTION


FOR WALLS, DOORS and your budget


WWW.ARCHITECTSDATAFILE.CO.UK ADF APRIL 2017


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