Wax Thermostatic Element LG0874A

• Light-duty load rating of 90N – The only model in the Legom wax element range with a maximum load below 140N, designed specifically for valve assemblies with low-resistance return springs or sensitive mechanisms
• Ultra-soft spring rate of 1N/mm – Five times softer than the 5N/mm spring rate used in all other Legom models, enabling precise piston travel in assemblies where stiffness would cause over-actuation or mechanical damage
• Five-stage stroke profile – Detailed characterization across five temperature segments including a narrow deceleration zone at 35°C~38°C (0.3mm) provides valve designers with precise actuation data at every critical temperature band
• Low minimum load of 15N – The lowest minimum load in the Legom range, confirming the element’s suitability for delicate, low-force thermostatic mechanisms
• 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.

• Light-duty thermostatic valve assemblies – The 90N maximum load and 1N/mm spring rate make the LG0874A the correct choice for valves with delicate internal mechanisms or light return springs where higher-force elements would cause over-actuation or component damage
• Compact plumbing thermostatic devices – Applied in small-format thermostatic valves and mixing devices where physical space constraints limit the spring force that can be accommodated in the valve body
• Automotive cooling system thermostats – Used in engine cooling thermostats with lighter valve designs requiring controlled, low-force actuation from 15°C through normal engine operating temperatures
• Sanitary and medical equipment – Integrated into precision thermostatic assemblies in hospital, laboratory, and hygiene-sensitive fixtures where low-force, staged temperature control is required
• HVAC and air conditioning systems – Applied in low-resistance thermostatic control assemblies within heating and cooling circuits where standard-force wax elements are mechanically unsuitable
• Shipping, military, and other industries – Suitable for specialized applications requiring self-acting, low-force thermostatic control without electrical dependency

• The LG0874A must be installed in direct contact with the fluid whose temperature it is intended to sense, ensuring accurate thermostatic response across all five stages of the stroke profile
• Ensure the element is fully immersed in the flow path within the host valve or assembly to prevent slow or inaccurate actuation, particularly important given the element’s narrow deceleration zone at 35°C~38°C
• Do not expose the element to temperatures exceeding 90°C, as sustained exposure above the maximum rated temperature may permanently degrade the wax charge
• The LG0874A has a maximum load of only 90N. Do not use this element in valve assemblies with return springs rated above this force, as the piston will not be able to fully extend under load
• The spring rate of 1N/mm is significantly softer than other Legom models. Ensure the host valve return spring stiffness is designed to match this spring rate to achieve accurate piston reset on cooling
• Keep the element away from external heat sources not part of the intended sensing medium to avoid premature actuation across any of the five stroke stages
• 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 LG0874A 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.