Operating Principle
A thermostatic mixing valve mixes hot and cold water in such a way as to maintain constant set
temperature of the mixed water at the outlet.
A thermostatic element is fully immersed into the mixed water. This element then contracts or
expands causing movement of the piston, closing either the hot or cold inlets, regulating the flow
rates entering the valve.
If there are variations of temperature or pressure at the inlets, the internal element automatically
reacts to restore the original temperature setting.
Thermal shutoff
In the event of a failure of either the hot or cold supply, the piston will shut off, stopping water
discharging from the mixed water outlet.
The Caleffi valve requires a minimum temperature differential from hot inlet to mixed water outlet of
18°F (10°C) to ensure the correct operation of the thermal shutoff feature.
COLD
HOT
MIXED
3
Sweat version
