TMVs protect against scalding by hot water in Colchester hospital

Published:  10 April, 2005

Oventrop thermostatic mixing valves combine the functions of bacteriological protection and safety in this new hospital facility in Colchester.

To eliminate the risk of scalding from domestic hot water in Colchester General Hospital, Oventrop Brawa-Mix thermostatic mixing valves have been installed in new HDU/ITU facilities. They have been installed on baths and hand basins by Bower Fuller of Ipswich.

Hot water needs to be stored above 65°C to avoid bacteriological contamination. Above 45°C, it can cause serious injury very quickly. Immersion at 60°C causes partial burns of the skin thickness in 7 s and full-thickness burns in 90 s.

Installed downstream from a calorifier or hot-water storage tanks, the Brawa-Mix mixes primary hot water with cold water from the mains or storage tank. The valve is designed so that mixed water engulfs the sensing head to maintain accurate temperature control. If there is no cold water, the hot-water port closes.

Features of the valve include the ability to function with water that is hot enough to combat bacterial contamination. Pressure differences of up to 5 bar between hot and cold supply can be tolerated. Flat-face unions enable these valves to be removed easily from rigid pipework.

The temperature of the delivered water can be adjusted from 35 to 65°C by a lockable handwheel.

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