Wax Thermostatic Element LG0829A
The LG0829A Wax Thermostatic Element is a standard-force, five-stage thermostatic actuator engineered for applications requiring graduated mechanical response across a 15°C to 90°C operating range, with a secondary deceleration zone at 45°C to 60°C. Built with Legom’s proprietary patented wax formula, it 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.
Operating on the standard Legom mechanical platform with a maximum load of 140N and a spring rate of 5N/mm, the LG0829A bridges the gap between simpler two or three-stage elements and the more complex profiles of models like the LG5701. Its stroke profile closely parallels the LGA253 in structure, but with a wider initial actuation band starting from 15°C rather than 26°C, making it more suitable for applications that require thermostatic response beginning nearer to ambient temperature.
Key Benefits
- Five-stage stroke profile with deceleration zone – Sequential and overlapping stroke specifications across 15°C~38°C, 38°C~45°C, 35°C~45°C, 45°C~60°C, and 15°C~90°C provide detailed actuation data including a deliberate reduced-stroke zone above 45°C
- Early ambient activation from 15°C – Begins responding near ambient temperature, making it suitable for applications that require thermostatic actuation to start before the fluid reaches mid-range temperatures
- Deceleration zone at 45°C~60°C – Reduced stroke of 0.86mm in this band creates a deliberate slowdown in piston travel above 45°C, enabling staged valve behavior at temperatures associated with hot water delivery and anti-scald thresholds
- Standard 140N load platform – Compatible with the full range of valve assemblies designed for standard Legom wax elements, without the mechanical constraints of the light-duty 90N models
- 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 | LG0829A |
| Material | Copper |
| Maximum Load | 140N |
| Minimum Load | 45N |
| Testing Load | 55N |
| Spring Rate | 5N/mm |
| Maximum Temperature | 90°C |
| Stroke | L = 20 ± 0.3mm at 38°C, 55N |
| Lifespan | 100,000 cycles |
| Certification | ACS, WRAS |
Temperature vs. Stroke
| Temperature (°C) | Stroke (mm) |
|---|---|
| 15°C ~ 38°C | 2 ± 0.2 |
| 38°C ~ 45°C | 1.4 ± 0.15 |
| 35°C ~ 45°C | 2 ± 0.2 |
| 45°C ~ 60°C | 0.86 ± 0.15 |
| 15°C ~ 90°C | 5.4 (Max) |
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) – The wide initial actuation band from 15°C and the deceleration zone above 45°C make the LG0829A suited for TMV designs requiring graduated valve opening from near-ambient through anti-scald temperatures
- Anti-scald and hot water safety devices – The natural slowdown in piston travel between 45°C and 60°C aligns with standard safe hot water delivery thresholds, enabling safer blended water output as temperatures approach scalding range
- HVAC zone control assemblies – Used in thermostatic control valves where a staged actuation profile is preferred over a simple linear opening characteristic across the full comfort and elevated temperature range
- Automotive engine cooling systems – Applied in engine thermostats requiring graduated actuation beginning from near-ambient cold-start temperatures through normal operating range
- Sanitary and medical equipment – Integrated into thermostatic valve assemblies in hospital and clinical settings where staged temperature control from ambient through hot water delivery temperatures is required
- Plumbing, shipping, military, and other industries – Suitable for any application requiring self-acting, multi-stage thermostatic control across a broad temperature span without electrical dependency
Installation Notes
- The LG0829A 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 closely spaced stage boundaries around 35°C~45°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 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 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
Frequently Asked Questions
How does the LG0829A compare to the LGA253, which has a similar stroke structure?
Both models feature a multi-stage stroke profile with a deceleration zone, but their temperature ranges differ. The LGA253 begins its primary actuation at 26°C and decelerates at 40°C~44°C before resuming at 44°C~53°C. The LG0829A begins earlier at 15°C and places its deceleration zone higher at 45°C~60°C. Choose the LG0829A when thermostatic response needs to begin closer to ambient temperature, or when the deceleration behavior is required specifically in the 45°C to 60°C band rather than around 40°C to 44°C.
How should I read the five-row stroke table?
The first row (15°C~38°C, 2mm) gives the initial actuation band. The second row (38°C~45°C, 1.4mm) shows the next sequential segment. The third row (35°C~45°C, 2mm) is an overlapping window that gives a combined stroke view across the 35°C to 45°C zone, useful for validating total valve travel in that sub-range. The fourth row (45°C~60°C, 0.86mm) shows the deceleration zone where stroke rate slows significantly. The fifth row (15°C~90°C, 5.4mm max) gives the total stroke ceiling across the full operating span. Refer to the Temperature VS. Stroke curve in the Datasheet for the complete graphical representation.
What certifications does the LG0829A hold?
The LG0829A 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 LG0829A?
The LG0829A is rated for 100,000 actuation cycles, supporting long-term deployment in high-use installations across its full 15°C to 90°C operating range.
Can the LG0829A 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 LG0829A 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.
