KERAFLO Ltd- VALVES REDUCE RISK OF COLD WATER STAGNATION AT
QUEENS HOSPITAL BURTON ON TRENT
 In
a recent refurbishment project, Keraflo Ltd. has supplied four KP
Type float valves to control the water levels in eight Dewey Waters
cold water storage tanks installed at Queens Hospital, Burton on
Trent. These 1,500 litre tanks are installed in pairs in four tank
rooms, replacing the original eight single tanks which had reached
the end of their operational lives and had, due to their size,
caused access problems. Each pair of tanks is installed in a
separate block and supplies all hot down feed and domestic cold
water services. Keraflo valves were selected by the design
consultant in order to ensure simultaneous fill of dual on-line
tanks.
Opened by Her Majesty The Queen in 1995, Queen’s Hospital, was a
major capital development which saw the centralization of
Burton-on-Trent’s hospital services to newly constructed premises on
the site of the former district hospital in Belvedere Road, two
miles from the town centre. This subsequent refurbishment of 30 year
old buildings that were part of the original district hospital
includes the installation of four new Dewey Waters tanks (two cold
water down services and two DHWS cold feed tanks) in each tank room.
These were located in four separate blocks housing the Burton
Clinic/Wards 19 & 20, ‘F’ Block, Accident &Emergency and the
Geoffrey Hodges Ward.
The consulting engineers Roger S Bullock Associates commented: ‘Each
pair of cold water services tanks was connected for parallel
operation and to achieve simultaneous flow, a Keraflo Aylesbury KB
Type 2’’ (50mm) pilot valve was installed in each tank, controlling
a Keraflo KP Type float valve with upstream pressure sustaining
valves installed. The system is working very well with equal water
flow being developed to each tank, thereby avoiding water
stagnation.’
Aylesbury KB Type valves are operated by transfer of weight in an
actuator tube which causes the valve to open or close in a single
delayed action, rather than giving the gradual opening and closing
achieved with a conventional ball valve. Attached to the actuator is
a 2m long chain with a float and buoy assembly which offers a fully
variable differential between opening and closing water level
settings by simple adjustment of the length of chain between the
actuator and the floats. Changes in water levels and settings can be
made quickly by the installer or maintenance engineer, as no tools
are required, making it particularly suitable for applications in
buildings with seasonal occupancy. Water discharge is via an ‘up and
over’ pipe to facilitate air gap compliance.
Keraflo delayed action float valves avoid water hammer, valve bounce
and pump hunting, which leads to improved pump performance and
maximum energy efficiency. In addition, they reduce the risk of
stagnation and water borne diseases which can occur when stored
water is not used for long periods of time, particularly at high
ambient temperatures in the summer months.
The Keraflo valves were supplied to Dewey Waters Ltd. via Keraflo
Agents Hurlstone & Partners and installed by Daly Engineering
Services Ltd.
Email:
info@keraflo.co.uk
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