Wax Thermostatic Element LG043X

• Only sub-zero activation element in the Legom range – Referenced and designed to activate at -5°C, below the freezing point of water, making it the correct choice for thermostatic assemblies that must respond under genuinely freezing conditions rather than near-freezing ones
• High single-band stroke of 5.5mm – Delivers 5.5 ± 0.5mm of piston travel across the entire -5°C to 15°C active range in a single band, providing decisive valve actuation with no intermediate stages or deceleration zones
• Sub-zero stroke reference point at -5°C – Unlike all other Legom models referenced at positive temperatures, the LG043X uses -5°C as the stroke reference condition, confirming the element is measured and calibrated in its intended sub-freezing operating environment
• Maximum temperature of 60°C – Lower than most Legom models’ 90°C rating, reflecting the element’s purpose-built freeze protection design where elevated temperatures are not part of normal operation
• Standard 140N load platform – Despite its specialized application, the LG043X operates on the standard Legom mechanical platform, compatible with valve assemblies designed for 140N maximum load
• 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
• OEM and ODM customization available – Temperature range, working stroke, and maximum load can be customized to suit specific project 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.

• Sub-zero freeze protection valve assemblies – The -5°C activation point makes the LG043X the correct actuator for freeze protection devices that must respond when temperatures drop below zero, before water freezes and causes pipe or valve damage
• Outdoor heat pump and HVAC pipe protection – Installed as the thermostatic element in anti-freeze valves protecting outdoor piping connecting heat pumps to indoor units in extreme cold climates where temperatures regularly fall below 0°C
• Cold-climate plumbing systems – Applied in thermostatic drain valves and frost protection assemblies in residential and commercial buildings in regions subject to severe winter conditions where near-zero or sub-zero temperatures are common
• Automotive and industrial cold-start systems – Used in cooling circuit thermostats or control valves that must activate at sub-zero temperatures during extreme cold-start conditions
• Refrigeration and cold-chain equipment – Integrated into thermostatic valve assemblies for refrigerated transport, cold-storage facilities, and industrial refrigeration systems where fluid or ambient temperatures fall below 0°C during normal operation
• Military and specialty applications – Suitable for equipment operating in arctic or extreme cold environments where standard above-zero thermostatic elements are insufficient for the required activation temperature

• The LG043X must be installed in direct contact with the fluid or ambient medium whose temperature it is intended to sense, ensuring accurate response at the -5°C activation threshold
• Ensure the element is fully immersed or fully exposed to the sensing medium within the host valve or assembly. Partial exposure will delay actuation and compromise freeze protection at the critical sub-zero threshold
• Do not expose the element to temperatures exceeding 60°C. The LG043X has a lower maximum temperature rating than most Legom models. Sustained exposure above 60°C may permanently degrade the wax charge
• 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 as temperature rises above 15°C, as the wax element generates push force only as temperature drops toward -5°C
• Keep the element away from heat sources not part of the intended sensing medium. Any stray heat that keeps the element above -5°C during freezing conditions will prevent the freeze protection from activating
• For freeze protection applications, verify that the system remains pressurized at all times, as most freeze protection valve mechanisms require system pressure to function correctly
• 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 LG043X 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.