Device for controlling overheating and scaling in an apparatus for heating a fluid and apparatus equipped with such a device
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United States of America Patent
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Jul 25, 1989
Grant Date -
N/A
app pub date -
Dec 11, 1987
filing date -
Dec 24, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An overheating and scaling control device for a fluid heating apparatus, such as a domestic water heater, removes the hot fluid in the heater when demand ceases. A piston (46) mobile within a case (28) separates the latter into two compartments (32, 36) respectively connected to the cold water supply pipe (16) and to the hot water discharge pipe (22). In operation, the pressure in pipe (16) is higher than the pressure in pipe (22) and piston (46) is moved to the left. On stopping, the pressures are equal in both pipes and spring (40) moves piston (46) to the right. Cold water is fed into the exchanger tube (20), so that the hot water contained in the latter is discharged into pipe (38) and compartment (36).
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