TEA-500 Thermoelectric Actuator

A thermoelectric actuator uses a PTC resistor-heated thermal element. When operating voltage is applied, the PTC warms up and heats the thermal element, therefore switch the valve open and close.


Temperature - Stroke Curve

* based on practical test data

Comparison against Wax Actuator

Test 1: Stroke Speed Test

Test two groups of Wisdom actuators and Wax-made ones, with 80N load, heating 6400ohms PTC resistance from +20°, record stroke height every 30 seconds.

Test result: at 30 sec. wax acutator stay silence, while Wisdom actuator already reach 0.98mm; at 120 sec. Wisdom actuator already arrives 4.5mm;while Wax actuator with stroke of 2.45mm only. In summary, Wisdom thermal actuators are rising much more rapidly than wax-made products.

Left: Wisdom actuator; right: Wax actuator

Test 2: Temperature - Stroke Comparison

Test two groups samples starting from 30°C till 90°C, with load of 80N. The stroke – temperature curve as below:

Summary 1): wax element start actually generating motion at 40°C; note that the piston beneath the element top.

Summary 2): Wisdom element start motion at 79°C, and grow stroke quite fast: between 79°C to 84°C, the element piston grows 5mm; while wax element grows 5.2mm between 69°C to 79°C. Wisdom element significantly faster than wax element as temperature incresses.

Left: Wisdom actuator; right: Wax actuator


The thermoelectric actuator is heated by PTC resistor ②, when the voltage power is applied through the electric wire ③, the PTC warms up and heats the thermal elements ①. The element expands and lift the spring in the valve, thus opens and closes the valve.