Thermal Actuators

Thermal Actuators

Custom Engineered for Your Application Requirements
A group of metal thermal actuators sitting next to each other

United Flexible has over 50 years of experience manufacturing thermal actuators. This vast history provides us a broad range of knowledge of thermal actuator performance and durability characteristics. Our Product Engineers are available to collaborate with you to develop thermal actuator solutions from the most basic of applications to those that are extremely complicated and unique. Our technical team will work closely with you throughout all stages of your product development, from the conceptual stage through production.

Capabilities of Thermal Actuators

  • Wax Motors
  • 40° F to 250° F Activation Temps
  • Thermal Flow Valves
  • Temperature Switches
  • Ported Vacuum Switches
  • Thermostatic Flow Valve
  • Over-Temp Valves
  • Freeze Protection Valves
Thermal actuator cross section diagram in color
  • A compact, rugged and dependable power source. Able to quickly transform heat energy into piston-driving mechanical energy. Fulton manufactures thermal actuators in many configurations, but all have two things in common. They operate very rapidly at specified temperatures and are reliable over a long lifetime.
  • Thermal actuators can withstand severe vibration and fluctuating pressures. Whether the temperature is extremely low or as high as 300°F (for short exposure periods), the thermal actuator will continue to operate at its set temperature.
  • A return load must be provided for proper thermal actuator operation. This load should typically be 10 lbs minimum and 25 lbs maximum. Although pressure changes do not affect the thermal actuator characteristics, stem loading does.
  • Return springs opposing stem movement should be selected to provide the minimum return loads listed above at minimum temperatures. Spring rates generally should be as low as possible since life expectancy is dependent on the maximum load to which the thermal actuator is subjected. In no case should the maximum load be exceeded (including the over-run).
  • The typical working stroke of Fulton’s thermal actuators is either .140” minimum or .260” minimum, depending on cup configuration. In some instances, working strokes can be obtained within a temperature range of 10°F, or as great as 100°F, most commonly over a 20°F range.

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