| 摘要 |
A water heating apparatus comprises a tank (1a, fig.1) having a water supply inlet and a hot water supply outlet. The tank contains a heating tube 7 having a fluid inlet and outlet, where the fluid inlet is connected to a source of heated fluid, such as that provided by a boiler, so that heated fluid flowing through the heating tube heats water in the tank. The water heating apparatus also has a safety device 10 to inhibit or reduce the flow of fluid through the heating tube. The safety device comprises a valve 11 biased to a closed condition, a valve control element biased to a first position in which the valve control element acts against the valve biasing to hold the valve open, and a tank temperature responsive member 12. In operation, if the temperature within the tank exceeds an operating temperature or temperature range, the temperature responsive member moves the valve control element from the first position to a second position in which the valve control member no longer acts against the valve biasing. In a further aspect, a safety device is disclosed comprising a valve biased to either an open condition or a closed condition.
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