TEA-504 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.

All New Design

The all new 504 series thermo-electric actuator, with unique design to save 15% volume. While its stroke height can reach at least 5.5mm and other technical performance remain the same as conventional ones.


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.