Thermal Working Elements
Thermal Working Elements

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Wax elements, their manufacturing processes and their application to regulation have been well understood for decades. However, the wax element high-pressure principle is far from obsolete.
Even the most up-to-date requirements can be met using this simple, yet extremely effective, precise and, above all, reliable technology.

Our wax elements have a straightforward design and a pressure tight housing which is open on one side. The open side is sealed off with a membrane or an elastomer insert.

A piston rests on the membrane or elastomer insert. The wax element is filled with a substance that expands dramatically when heated. The increase in volume that results is transmitted to a piston via the membrane or the elastomer insert.

The piston is then pushed out of the wax element and assumes a variable function. A spring element is required to reposition the piston when cooled. It is, therefore, essentially a temperature-controlled high-pressure hydraulic actuator with very high operating power.

Millions of our thermostats are used all over the world by the automotive industry and in other industrial applications to provide the right type of precision temperature regulation on a systematic basis.


Automotive and industrial applications:

  • Thermostat inserts
  • Integral thermostats
  • Map-controlled thermostats
  • Housing thermostats
  • Temperature switches and sensors
  • Gear and engine oil temperature regulators
  • Oil pressure switches
  • Wax elements for use in coolants, oil, air and fuels