Wax thermostatic element
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The wax thermostatic element was invented in 1934 by Sergius Vernet. Its principal application is in automotive thermostats used in the engine cooling system. The first applications in the plumbing an
Car engine wax thermostatic element
Double-valve engine thermostat
Thermostatic radiator valve
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A thermostatic radiator valve is a self-regulating valve fitted to a hot-water heating system radiator to control the temperature of a room by changing the flow of hot water to the radiator.
Wax thermostatic element
…thermal expansion of waxes when they melt. This wax motor principle also finds applications besides engine cooling systems, including heating system thermostatic radiator valves, plumbing, industrial, and agriculture. The internal combustion engine cooling thermostat maintains the temperature of the engine near its optimum…
A thermostatic radiator valve on position 2 (15–17 °C)
A sprung radiator valve with the wax-motor thermostatic controller removed. With the controller removed the valve is fully open so the radiator simply operates at full power; with the controller in place, as air temperature increases the wax motor depresses the protruding pin, closing the valve.
Cutaway model of a thermostatic radiator valve