Wax Thermostatic Element LG004X
The LG004X Wax Thermostatic Element is a multi-stage thermostatic actuator engineered for applications requiring graduated mechanical response across a 15°C to 90°C operating range. Built with Legom’s proprietary patented wax formula, the LG004X 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 four distinct stroke specifications covering different temperature bands from 15°C through 90°C, the LG004X is designed for thermostatic assemblies where the valve response must be carefully calibrated across multiple temperature thresholds. Constructed from copper with a maximum load of 140N and a spring rate of 5N/mm, it provides reliable actuation suited to plumbing, HVAC, automotive, and sanitary applications.
Key Benefits
- Four-stage stroke profile – Separate stroke specifications across four temperature bands from 15°C to 90°C enable detailed proportional control characterization for complex thermostatic valve designs
- Low activation start point – Begins responding from 15°C, earlier than most other Legom models, making it suitable for systems that require thermostatic actuation to begin near ambient temperature
- Graduated stroke across the full range – The progressive stroke profile across 15°C~38°C, 38°C~55°C, 55°C~60°C, and 38°C~90°C bands provides designers with precise actuation data at each critical temperature segment
- 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 | LG004X |
| Material | Copper |
| Maximum Load | 140N |
| Minimum Load | 45N |
| Testing Load | 55N |
| Spring Rate | 5N/mm |
| Maximum Temperature | 90°C |
| Stroke | L = 16 ± 0.25mm at 25°C, 55N |
| Lifespan | 100,000 cycles |
| Certification | ACS, WRAS |
Temperature vs. Stroke
| Temperature (°C) | Stroke (mm) |
|---|---|
| 15°C ~ 38°C | 1.1 ± 0.15 |
| 38°C ~ 55°C | 1.25 ± 0.15 |
| 55°C ~ 60°C | 0.35 ± 0.08 |
| 38°C ~ 90°C | 2.6 ± 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
- Thermostatic mixing valves (TMV) – Installed as the thermostatic actuator in hot water mixing valves requiring proportional response beginning near ambient temperature and continuing through hot water delivery ranges
- Anti-scald and hot water safety devices – Applied in plumbing fixtures and safety valves where the element must respond progressively as water temperature rises from ambient through the 38°C to 60°C scald-risk zone
- HVAC and air conditioning systems – Provides multi-stage temperature-responsive mechanical actuation in water circuit control assemblies across both low and elevated operating temperatures
- Automotive engine cooling systems – Applied in engine thermostats and cooling circuit controls requiring graduated actuation beginning from low coolant temperatures during cold-start through full operating temperature
- Sanitary and medical equipment – Integrated into thermostatic assemblies for hospital and laboratory fixtures where precise, staged hot water delivery control is required across multiple temperature thresholds
- Shipping, military, and other industries – Suitable for demanding environments where self-acting, multi-stage temperature-responsive actuation is required without electrical dependency
Installation Notes
- The LG004X must be installed in direct contact with the fluid whose temperature it is intended to sense, ensuring accurate thermostatic response across the full 15°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, 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 or incorrect actuation
- 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 LG004X different from other Legom wax thermostatic elements?
The LG004X has the most detailed stroke characterization in the Legom wax element lineup, with four separate stroke specifications across different temperature bands starting from 15°C. This makes it the appropriate choice for valve designers who need precise actuation data at multiple temperature thresholds rather than a single primary activation point. Its low start temperature of 15°C also means it begins responding earlier than most other models in the range.
What certifications does the LG004X hold?
The LG004X 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 LG004X?
The LG004X is rated for 100,000 actuation cycles, supporting long-term deployment in high-use installations across its full operating temperature range.
How should I read the four-row stroke table?
The table provides stroke values across four different temperature segments. The first three rows (15°C~38°C, 38°C~55°C, and 55°C~60°C) describe incremental stroke movement within each consecutive band, showing how the piston advances in stages as temperature rises. The fourth row (38°C~90°C) gives the total cumulative stroke from 38°C to the upper limit, useful for understanding the full travel available above the primary activation threshold. Refer to the Temperature VS. Stroke curve in the Datasheet for the complete graphical representation of both heating-up and cooling-down cycles.
Can the LG004X be customized for different temperature or stroke requirements?
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 LG004X 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.
