Wax Thermostatic Element LG041X

• Strongly accelerating stroke profile – Each successive 5°C band delivers more than double the stroke of the previous one (0.58mm → 1.42mm → 2.47mm), producing a strongly non-linear valve opening response that accelerates as temperature rises toward 60°C
• Largest stroke in the final band – The highest stroke occurs between 55°C and 60°C (2.47mm), ensuring the greatest valve travel is concentrated at the temperatures most critical for hot water safety and anti-scald protection
• Gradual initial response at 45°C~50°C – The small initial stroke of 0.58mm in the first band means the valve opens slowly as temperature first crosses 45°C, then accelerates sharply as temperature rises further, mimicking the natural urgency of anti-scald response
• 50°C stroke reference point – Calibrated and measured at 50°C, confirming the element’s design intent for high-temperature applications rather than ambient or comfort-range control
• 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
• Rated for 100,000 cycles – Exceptional service life verified through rigorous lifecycle testing, ensuring reliable long-term performance in high-use installations
• 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. Refer to the Temperature VS. Stroke curve in the Datasheet for the full graphical representation.

• Anti-scald thermostatic mixing valves – The accelerating stroke profile with maximum travel at 55°C~60°C is ideally suited for TMV assemblies where valve intervention must become increasingly aggressive as water temperature rises through the scalding threshold, ensuring decisive shut-off before temperature reaches dangerous levels
• Hot water safety devices – Applied in safety valves where a slow initial response at 45°C~50°C preserves normal hot water access while the rapidly increasing stroke above 55°C provides strong protective intervention
• HVAC high-temperature circuit control – Used in thermostatic control assemblies for heating circuits where the valve must modulate gradually at first then respond aggressively as system temperature approaches an upper setpoint
• Automotive engine cooling systems – Applied in engine thermostats requiring gradual initial opening during warm-up with increasing flow rate as the engine reaches normal operating temperature in the 55°C~60°C range
• Sanitary and medical equipment – Integrated into hot water control assemblies in hospital and clinical fixtures where the element’s natural acceleration in the scalding zone provides a safety-aligned response characteristic
• Plumbing, shipping, military, and other industries – Suitable for applications requiring self-acting thermostatic control with an accelerating stroke response concentrated at high temperatures

• The LG041X must be installed in direct contact with the fluid whose temperature it is intended to sense, ensuring accurate accelerating response across all three bands from 45°C to 60°C
• Ensure the element is fully immersed in the flow path within the host valve or assembly to prevent slow or inaccurate actuation, particularly important for the final 55°C~60°C band where the highest stroke occurs
• 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 mechanism must accommodate the full cumulative stroke across all three bands. Ensure sufficient travel space in the valve body for the combined stroke output up to 60°C
• The host valve or actuator assembly must provide adequate spring-back force to reset the piston on cooling, as the wax element generates push force only during heating
• Keep the element away from external heat sources not part of the intended sensing medium to avoid premature actuation in the high-stroke upper bands
• 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 LG041X 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.