Wax Thermostatic Element LG002X

• Dual-range capability – Active at both the freeze protection threshold (1.6°C~4°C, 4.5 ± 0.45mm stroke) and across the full operating span up to 90°C, covering both low-temperature protection and standard HVAC control in a single element
• Widest total stroke range – Total stroke of ≤10mm across 1°C to 90°C, the largest cumulative stroke span among Legom wax elements, providing maximum proportional control range for complex valve assemblies
• Independently verified lifecycle performance – Dimensional stability confirmed at two milestones: length ≥19.5mm after 30,000 cycles and ≥19.2mm after 100,000 cycles, demonstrating consistent performance throughout service life
• High testing load of 90N – Provides strong actuation force at the 25°C reference point with spring elastic stiffness of 5N/mm, suitable for valve assemblies requiring firm piston engagement
• Patented wax formula – Proprietary Legom formulation delivers superior sensitivity and temperature-response accuracy versus standard wax elements
• ACS and WRAS certified – Passed European experimental institution product certification, confirming suitability for potable water and HVAC applications in international markets
• Copper construction – Corrosion-resistant material ensures long-term durability in wet and thermally cycled environments
• OEM and ODM customization available – Temperature range, working stroke, and maximum load can be customized to suit specific product requirements

Temperature vs. Stroke

Stroke values measured during heating-up cycle. Cooling-down cycle may exhibit slight hysteresis typical of wax thermostatic elements. Spring elastic force is 90N at 25°C with spring elastic stiffness of 5N/mm. Refer to the Temperature VS. Stroke curve in the Datasheet for the full graphical representation.

Lifecycle Performance

• After 30,000 cycles of life testing, length shall be no less than 19.5mm
• After 100,000 cycles of life testing, length shall be no less than 19.2mm

• Anti-freeze valve assemblies – The 1.6°C to 4°C activation stroke of 4.5mm makes the LG002X suitable as the thermostatic actuator inside freeze protection valves for heat pump systems and outdoor piping exposed to sub-4°C temperatures
• Thermostatic mixing valves (TMV) – The wide total stroke range up to 90°C allows integration into thermostatic mixing valves where the element must remain proportionally active from near-freezing through full hot water delivery temperature
• HVAC and underfloor heating systems – Applied in thermostatic control assemblies for heating circuits where the element must respond across both system startup (low temperature) and full operating conditions
• Solar thermal and heat pump systems – Used in thermostatic assemblies where fluid temperature spans a wide range from near-ambient in standby to elevated temperatures during active operation
• Automotive engine cooling systems – Applied in engine thermostats requiring reliable actuation beginning from very low coolant temperatures during cold-start through full operating temperature
• Plumbing, sanitary, shipping, military, and other industries – Suitable for any application requiring self-acting thermostatic control across a broad temperature range without electrical dependency

• The LG002X must be installed in direct contact with the fluid whose temperature it is intended to sense, ensuring accurate thermostatic response across the full 1°C to 90°C operating range
• Ensure the element is fully immersed in the flow path within the host valve or assembly to prevent slow or inaccurate actuation caused by partial exposure to the medium
• Do not expose the element to temperatures exceeding 90°C, as sustained exposure above the maximum rated temperature may permanently degrade the wax charge and reduce stroke accuracy
• Avoid applying forces exceeding the maximum load of 140N to the piston during assembly or operation
• The host valve or actuator assembly must provide adequate spring-back force to reset the piston on cooling. Note that spring elastic force at 25°C is 90N with stiffness of 5N/mm – ensure the host assembly spring is compatible with these values
• Keep the element away from external heat sources not part of the intended sensing medium to avoid premature or incorrect actuation, particularly important given the element’s sensitivity starting from 1.6°C
• For OEM integration, confirm three key parameters in writing before finalizing the order: temperature range, working stroke, and maximum load

Legom supports full OEM and ODM services for the LG002X Wax Thermostatic Element. Our engineering team can customize the activation temperature range, working stroke, and maximum load to match your product requirements. Before any commitment, written confirmation of three key performance parameters is required: temperature range, working stroke, and maximum load. All customization projects are handled with strict confidentiality. Contact us via WhatsApp or info@legomsmart.com.