Wax Motor


A Wax Motor is an actuating device that consists of a positive temperature coefficient thermistor (PTC) mounted to a sealed vessel filled with a solid wax. As the solid wax is heated to a controlled temperature by the energized thermistor, the wax melts and expands, driving a spring-loaded piston outward. Depending upon the orientation of the vessel within its housing and the configuration of the spring, this piston may pull in or push out a load. When the thermistor is de-energized, the liquid wax cools and the spring returns the piston to its original position.
Wax Motors should be considered for applications where quiet, smooth, and efficient actuation is desired which include: liquid and detergent dispensers, air flow control, water diverter valves, thermal time delays, door safety locks, and noise dampers.

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