Wax Thermostatic Element LG003X
The LG003X Wax Thermostatic Element is a narrow-band, high-precision thermostatic actuator engineered for applications requiring sensitive mechanical response in the 32°C to 40°C activation range. Built with Legom’s proprietary patented wax formula, the LG003X delivers consistent, repeatable stroke actuation across a rated lifespan of 100,000 cycles. It has passed European product certification by accredited institutions including ACS and WRAS.
With a total active stroke window of only 8°C and a high testing load of 90N, the LG003X is designed for applications where the thermostatic response must occur within a tightly defined temperature band close to human body temperature. This makes it particularly well suited for body temperature-sensitive plumbing devices, automotive thermostat systems, and medical or sanitary equipment requiring precise low-range actuation. Constructed from copper with a maximum load of 140N and a spring rate of 5N/mm.
Key Benefits
- Narrow 8°C activation window – Active stroke concentrated between 32°C and 40°C, enabling highly sensitive thermostatic response within a tightly defined band near body temperature
- High testing load of 90N – Among the highest testing load values in the Legom range, providing strong and decisive actuation force within the narrow activation band
- Two-stage stroke characterization – Separate stroke data for 32°C~34°C and 34°C~40°C sub-bands allows valve designers to understand actuation behavior at each stage of the response curve
- 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
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LG003X |
| Material | Copper |
| Maximum Load | 140N |
| Minimum Load | 45N |
| Testing Load | 90N |
| Spring Rate | 5N/mm |
| Maximum Temperature | 90°C |
| Stroke | L = 19.9 ± 0.3mm at 34°C, 90N |
| Lifespan | 100,000 cycles |
| Certification | ACS, WRAS |
Temperature vs. Stroke
| Temperature (°C) | Stroke (mm) |
|---|---|
| 32°C ~ 34°C | 1.8 ± 0.2 |
| 34°C ~ 40°C | 1.5 ± 0.2 |
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.
Application & Use Cases
- Body temperature-sensitive plumbing devices – The 32°C to 40°C activation range overlaps with human body temperature, making the LG003X well suited for thermostatic assemblies designed to respond to body-contact water temperatures in showers, baths, and washbasins
- Automotive thermostat systems – Applied in engine cooling thermostats that must begin opening at precise low temperatures during warm-up phases to regulate coolant flow through the radiator circuit
- Sanitary and medical equipment – Integrated into thermostatic valves and mixing assemblies in hospital and clinical settings where water temperature must be controlled within a narrow band for patient safety and hygiene compliance
- HVAC and air conditioning systems – Used in low-temperature control assemblies where thermostatic actuation is required to begin at or near ambient comfort temperature ranges
- Plumbing and potable water systems – Applied in thermostatic devices regulating warm water supply where early, sensitive actuation at body-comfort temperatures is a design requirement
- Shipping, military, and other industries – Suitable for demanding environments requiring self-acting, narrow-band thermostatic control without electrical dependency
Installation Notes
- The LG003X must be installed in direct contact with the fluid whose temperature it is intended to sense, ensuring accurate thermostatic response within the narrow 32°C to 40°C activation window
- Ensure the element is fully immersed in the flow path within the host valve or assembly. Partial immersion is particularly problematic for narrow-band elements as it reduces sensitivity and delays actuation at the intended threshold
- 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, 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. Stray heat is especially impactful for narrow-band elements and can trigger premature actuation outside the intended temperature window
- For OEM integration, confirm three key parameters in writing before finalizing the order: temperature range, working stroke, and maximum load
Frequently Asked Questions
What makes the LG003X different from other Legom wax thermostatic elements?
The LG003X has the narrowest active temperature window in the Legom wax element lineup at just 8°C (32°C to 40°C), and one of the highest testing loads at 90N. This combination of narrow-band sensitivity and high actuation force makes it the appropriate choice for applications where the valve must respond precisely and forcefully within a tightly defined temperature range near human body temperature, rather than across a broad operating span.
What certifications does the LG003X hold?
The LG003X has passed European experimental institution product certification under ACS and WRAS standards, confirming its suitability for use in drinking water systems and broader HVAC and plumbing applications in certified markets.
What is the expected service life of the LG003X?
The LG003X is rated for 100,000 actuation cycles, supporting long-term deployment in high-use installations where the element cycles repeatedly through its narrow activation range.
How should I read the two-row stroke table?
The two rows represent consecutive segments of the activation range. The first row (32°C~34°C, 1.8 ± 0.2mm) shows the initial stroke as the element enters its activation window, where most of the early piston travel occurs in a short 2°C span. The second row (34°C~40°C, 1.5 ± 0.2mm) shows the additional stroke delivered as temperature continues to rise through the upper portion of the band. Together they describe the total actuation profile across the full 32°C to 40°C window.
Can the LG003X be customized for a different activation temperature range?
Yes. Legom offers full OEM and ODM customization. If your application requires a different activation temperature, working stroke, or load specification, the engineering team can develop a customized solution. Written confirmation of three key parameters is required before any customization project begins: temperature range, working stroke, and maximum load.
How do I select the right wax thermostatic element for my product?
The key selection criteria are the required activation temperature range, the working stroke needed to actuate your valve mechanism, and the maximum load the element must deliver. If you are unsure about any of these parameters, the Legom team can assist with selection or develop a custom element. Contact us via WhatsApp or email to begin the process.
OEM & ODM Customization
Legom supports full OEM and ODM services for the LG003X 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.
Datasheet
Product information last reviewed by the Legom Technical Team. For the most current specifications, refer to the official datasheet or contact our sales team.
Custom OEM & ODM Solutions
Legom is a direct manufacturer offering end-to-end OEM and ODM services. With our in-house engineering and production capabilities, we work closely with distributors and system integrators to deliver fully customized solutions under strict NDA.
