Keraflo float valves avoid stagnation in hospital cold-water storage tanks

Keraflo KP float valves have been installed on large pipes at Queen’s Hospital, Burton on Trent, to ensure the simultaneous filling of dual on-line 1500 litre cold-water storage tanks. Four valves serve four pairs of tanks that replace eight single tanks which had reached the end of their operational lives. Each new pair of tanks is installed in a separate block and supplies all hot down feed and domestic-cold-water services. Consulting engineers Roger S. Bullock Associates explain that each pair of cold-water-services tanks is connected for parallel operation and that to achieve simultaneous flow a Keraflo Aylesbury KB 50 mm pilot valve is installed in each tank controlling a KP float valve with upstream pressure-sustaining valves installed. Delivering equal water flow to each tank avoids water stagnation. Aylesbury float mechanisms cause valves to open or close in a single, delayed action — rather than giving the gradual opening and closing achieved with a conventional ball valve. The water levels at which valves are opened and closed can be readily set by the installer or maintained engineer, making the system particularly suitable for buildings with seasonal occupancy.

Related links:

• www.keraflo.co.uk

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