Wax Thermostatic Element LG0874
The LG0874 Wax Thermostatic Element is a light-duty, six-stage thermostatic actuator sharing the same low-force mechanical platform as the LG0874A, while delivering a more detailed stroke characterization across the 15°C to 90°C operating range. 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.
With a maximum load of 90N, a spring rate of 1N/mm, and six specified stroke segments providing cumulative travel data at 46°C, 49°C, and 60°C milestones, the LG0874 gives OEM engineers the most granular actuation characterization available within the Legom light-duty element category. The total stroke ceiling of 3.9mm across the full 15°C to 90°C span is slightly higher than the LG0874A, offering marginally greater valve travel for assemblies that can accommodate it. Constructed from copper with the same body dimensions as the LG0874A.
Key Benefits
- Most detailed light-duty stroke profile in the Legom range – Six stroke segments with three cumulative reference points above 38°C (at 46°C, 49°C, and 60°C) give valve designers granular data for precise mechanism sizing in low-force assemblies
- Light-duty load rating of 90N – Designed for valve assemblies with low-resistance return springs or delicate mechanisms where standard 140N elements would overdrive the host component
- Ultra-soft spring rate of 1N/mm – Enables precise, controlled piston travel in assemblies where standard 5N/mm stiffness would cause over-actuation or mechanical damage
- Three above-threshold cumulative stroke references – Stroke data at 38°C~46°C, 38°C~49°C, and 38°C~60°C allow designers to verify valve travel at multiple points across the active range, not just at the temperature ceiling
- 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 | LG0874 |
| Material | Copper |
| Maximum Load | 90N |
| Minimum Load | 15N |
| Testing Load | 45N |
| Spring Rate | 1N/mm |
| Maximum Temperature | 90°C |
| Stroke | L = 17.8 ± 0.3mm at 38°C, 45N |
| Lifespan | 100,000 cycles |
| Certification | ACS, WRAS |
Temperature vs. Stroke
| Temperature (°C) | Stroke (mm) |
|---|---|
| 15°C ~ 38°C | 1.2 ± 0.1 |
| 35°C ~ 38°C | 0.4 ± 0.05 |
| 38°C ~ 46°C | 1.15 ± 0.1 |
| 38°C ~ 49°C | 1.4 ± 0.1 |
| 38°C ~ 60°C | 1.8 ± 0.15 |
| 15°C ~ 90°C | 3.9 (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
- Precision light-duty thermostatic valve assemblies – The 90N maximum load, 1N/mm spring rate, and six-stage stroke profile make the LG0874 the most comprehensively characterized option for OEM engineers designing low-force thermostatic mechanisms
- Compact plumbing and sanitary thermostatic devices – Applied in small-format thermostatic valves where physical and mechanical constraints limit the spring force available in the valve body
- Automotive cooling system thermostats – Used in engine cooling thermostats with lighter valve designs requiring controlled, graduated actuation with detailed reference data at 46°C, 49°C, and 60°C milestones
- Medical and laboratory equipment – Integrated into precision thermostatic assemblies in hospital and clinical fixtures where low-force, carefully staged temperature control with verified intermediate stroke values is required
- HVAC and air conditioning systems – Applied in low-resistance thermostatic control assemblies where the detailed stroke profile supports proportional valve control across the full comfort and elevated temperature range
- Shipping, military, and other industries – Suitable for specialized applications requiring self-acting, low-force, multi-stage thermostatic control without electrical dependency
Installation Notes
- The LG0874 must be installed in direct contact with the fluid whose temperature it is intended to sense, ensuring accurate thermostatic response across all six 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 for the 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 LG0874 has a maximum load of only 90N. Do not use this element in valve assemblies with return springs rated above this force
- The spring rate of 1N/mm is significantly softer than other Legom models. Ensure the host valve return spring stiffness is matched to 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 six 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
What is the difference between the LG0874 and the LG0874A?
Both models share identical mechanical load specifications: 90N maximum load, 15N minimum load, 45N testing load, and 1N/mm spring rate. The differences are in their stroke profiles and total stroke output. The LG0874 has six stroke segments compared to five in the LG0874A, and adds an additional cumulative reference point at 38°C~49°C that the LG0874A does not specify. The LG0874 also has a slightly higher total stroke ceiling of 3.9mm versus 3.6mm for the LG0874A. Choose the LG0874 when you need more detailed intermediate stroke data above 38°C, or when the valve design can accommodate the marginally higher total stroke.
How should I read the six-row stroke table?
The first row (15°C~38°C, 1.2mm) gives the initial actuation band. The second row (35°C~38°C, 0.4mm) zooms into the final 3°C of that band to show the deceleration approaching 38°C. Rows three, four, and five (38°C~46°C, 38°C~49°C, 38°C~60°C) are cumulative stroke references from 38°C to three progressively higher temperature milestones, showing how total piston travel builds as temperature rises above the 38°C threshold. The sixth row (15°C~90°C, 3.9mm 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 view.
What certifications does the LG0874 hold?
The LG0874 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 LG0874?
The LG0874 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 LG0874 be customized for different load or temperature 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 your valve assembly has a light return spring or a low-resistance mechanism, both the LG0874 and LG0874A are appropriate starting points. Contact us via WhatsApp or email and our team will assist with the final selection between the two models based on your specific stroke requirements.
OEM & ODM Customization
Legom supports full OEM and ODM services for the LG0874 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.
