Wax Thermostatic Element LGX066
The LGX066 Electrically-Heated Wax Thermostatic Element is a large-stroke, voltage-actuated thermostatic element that delivers controlled mechanical displacement of 12 ± 1.2mm on electrical command, using Legom’s proprietary patented wax formula as the actuation medium. Available in 24V, 110V, and 220V variants, it is designed for valve and actuator assemblies requiring substantially greater piston travel than standard electrically-heated wax elements can provide. It has passed European product certification by accredited institutions including ACS and WRAS.
With a stroke output of 12mm — more than double the LGX7388 (4.8mm) and over three times the LGX2725 (3.8mm) — the LGX066 is the highest-stroke electrically-heated wax element in the Legom range. Its soft spring rate of 1N/mm is specified directly in the datasheet, distinguishing it from other electrically-heated models where spring rate is not published. Full stroke is achieved within 6 minutes of power application, and the element retracts passively on power removal within the same cycle time.
Key Benefits
- Largest stroke in the Legom electrically-heated range – Delivers 12 ± 1.2mm of piston travel on electrical command, more than double the LGX7388 (4.8mm) and more than three times the LGX2725 (3.8mm), enabling larger valve opening and greater flow control range
- Electrically-commanded actuation – Activates on applied voltage rather than responding to ambient fluid temperature, enabling integration into automated control systems, BMS platforms, and timed or remote valve control applications
- Specified spring rate of 1N/mm – The only Legom electrically-heated element with a published spring rate, providing OEM designers with precise return force data for valve mechanism design and piston reset calculation
- Three voltage variants – Available in 24V for building automation systems, 110V for North American mains applications, and 220V for European mains applications
- Fast response time – Start response time under 2 minutes and full stroke completion under 6 minutes after power is applied
- Verified long-term durability – Stroke length change kept below 8% after 30,000 cycles of 5-minute on / 5-minute off cycling, approximately 250 days of continuous operation
- Patented wax formula – Proprietary Legom formulation delivers consistent, repeatable stroke output with each electrical actuation cycle
- ACS and WRAS certified – Passed European experimental institution product certification, confirming suitability for potable water and HVAC applications in international markets
- OEM and ODM customization available – Voltage, stroke, force, and response time can be customized for specific product requirements
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | LGX066 |
| Working Voltage | 24V / 110V / 220V |
| Material | Copper |
| Maximum Force | 140N |
| Minimum Force | 45N |
| Testing Force | 55N |
| Spring Rate | 1N/mm |
| Stroke | L = 12 ± 1.2mm |
| Max Working Temperature | 90°C |
| Start Response Time | < 2 minutes |
| Finish Response Time | < 6 minutes |
| Durability | 30,000 cycles (≈ 250 days, 5 min on / 5 min off); stroke change < 8% |
| Certification | ACS, WRAS |
Application & Use Cases
- Large-travel electrically-controlled valve assemblies – The 12mm stroke makes the LGX066 suited for valve mechanisms requiring substantial piston displacement on electrical command, such as large-bore zone valves, diverting valves, and proportional control valves in HVAC and plumbing systems
- Building automation and zone control systems – The 24V variant integrates directly with standard BMS outputs and smart building controllers for electrically-commanded zone valve actuation with greater valve opening range than standard 4.8mm elements allow
- Automated plumbing control systems – Applied in motorized valve assemblies for automated domestic hot water recirculation, scheduled flow control, and remote shut-off where larger valve travel is a design requirement
- HVAC proportional control applications – Used in valve assemblies where electrical command must translate into a proportionally larger valve opening than compact wax elements can achieve, enabling better flow modulation across the valve’s operating range
- Automotive and industrial applications – Applied in electrically-commanded fluid circuit valves requiring greater actuator displacement than the LGX7388 or LGX2725 series can provide
- Sanitary and medical equipment – Integrated into electrically-controlled mixing and diverting valves in clinical or laboratory settings where larger valve stroke range is required for precise flow management
Installation Notes
- Select the correct voltage variant before connecting — 24V, 110V, or 220V. Note that 12V is not available for the LGX066; if a 12V variant is required, refer to the LGX7388 or LGX2725 series
- The element requires up to 2 minutes to begin stroke and up to 6 minutes to reach full 12mm stroke after power is applied. Design control system timing and valve response requirements accordingly
- After power is removed, the piston retracts passively as the wax cools. The spring rate of 1N/mm defines the return force characteristic — ensure the host valve return spring provides adequate force above the 45N minimum load to achieve complete piston reset
- The host valve mechanism must accommodate the full 12mm stroke without mechanical obstruction. Verify axial clearance in the valve body before finalizing the installation design
- Do not expose the element to ambient temperatures exceeding 90°C
- Avoid applying forces exceeding the maximum force of 140N to the piston during assembly or operation
- For OEM integration, confirm four key parameters in writing before finalizing the order: working voltage, stroke, response time requirement, and maximum force
Frequently Asked Questions
How does the LGX066 compare to the LGX7388 and LGX2725 electrically-heated elements?
All three are electrically-heated wax elements with the same activation mechanism. The primary differentiator is stroke output: the LGX066 delivers 12mm — more than double the LGX7388 (4.8mm) and more than three times the LGX2725 (3.8mm). The LGX066 also has a specified spring rate of 1N/mm not published for the other two series, and is available in only three voltage variants (24V, 110V, 220V) compared to four (adding 12V) for the LGX7388 and LGX2725. Choose the LGX066 when larger valve travel is a primary design requirement and 12V compatibility is not needed.
Why is 12V not available for the LGX066?
The LGX066 delivers a larger stroke of 12mm, which requires greater energy input from the heating element to expand the wax charge sufficiently. At 12V, the power available at practical resistance values is insufficient to reliably achieve this larger stroke within the required response time. The 24V, 110V, and 220V variants provide the necessary power levels. If a 12V electrically-heated element is required, the LGX7388 (12V, 4.8mm stroke) or LGX2725 (12V, 3.8mm stroke) are the appropriate alternatives.
What is the durability testing cycle for the LGX066?
The LGX066 is tested using a 5-minute on / 5-minute off cycling protocol, slightly different from the 6-minute on / 6-minute off used for the LGX7388 and LGX2725. After 30,000 such cycles — approximately 250 days — the stroke length change must remain below 8% of the original value, confirming reliable mechanical performance over an extended service life.
What certifications does the LGX066 hold?
The LGX066 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.
Can the LGX066 be customized for different voltage, stroke, or force requirements?
Yes. Legom offers full OEM and ODM customization for the electrically-heated element series including working voltage, stroke, spring rate, response time, and maximum force. Written confirmation of key parameters is required before any customization project begins. Contact us via WhatsApp or email to discuss your requirements.
OEM & ODM Customization
Legom supports full OEM and ODM services for the LGX066 Electrically-Heated Wax Thermostatic Element. Our engineering team can customize working voltage, stroke, spring rate, response time, and maximum force to match your product requirements. Before any commitment, written confirmation of key performance parameters is required: working voltage, stroke, maximum force, and response time. 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.
