Thermostatic radiator valve
Videos
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.
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
Wax motor
Videos
A wax motor is a linear actuator device that converts thermal energy into mechanical energy by exploiting the phase-change behaviour of waxes. During melting, wax typically expands in volume by 5–20%.
Thermostatic radiator valve
…of a room by changing the flow of hot water to the radiator. The classic thermostatic radiator valve contains a plug, typically made of wax (forming a wax motor), which expands or contracts with the surrounding temperature. This plug is connected to a pin which in turn is connected to a valve. The valve gradually…
Thermostatic radiator valves
A wax motor manufactured by iSwell