HFT40017T-01 Memory Alloy Thermostatic Valve, G3/4
The Legom HFT40017T-01 Memory Alloy Thermostatic Valve G3/4 is a domestic and light commercial thermostatic mixing valve using a shape memory alloy (SMA) thermostatic element in a G3/4 internal thread body. Where conventional TMVs use a wax cartridge to sense temperature and actuate the mixing plug, the HFT40017T-01 uses a metallic SMA element that recovers its programmed shape with exceptional repeatability across millions of cycles — providing long-term calibration stability without the wax capsule leakage risk associated with wax cartridge designs.
With a temperature adjustment range of 20–60°C, control accuracy of ±2°C, and working pressure range of 0.03–1 MPa, the HFT40017T-01 delivers the same temperature performance as the wax-cartridge HFT30001 G3/4 at the same connection size, with the addition of SMA technology’s inherently longer service life between interventions. Manufactured from 57-3 copper with nickel plating with a white ABS silk-screen handwheel.
Key Benefits
- Shape memory alloy element — no wax capsule – Solid-state metallic actuation with no liquid wax to contain, eliminating the wax micro-leakage failure mode and providing cycle fatigue resistance orders of magnitude beyond conventional wax cartridges
- G3/4 connection for domestic and light commercial use – Standard DN20 connection size compatible with domestic water heater outlets and light commercial installations, making the SMA technology accessible at the most common TMV connection size
- Same accuracy as wax TMVs — longer calibration life – ±2°C accuracy identical to the HFT30001 G3/4 wax model, with the additional benefit of the SMA element’s inherent resistance to performance drift over extended service
- ±2°C temperature control accuracy – Consistent mixed water delivery within ±2°C of the set point across varying supply pressure and temperature conditions
- 20–60°C adjustment range – White handwheel allows full-range adjustment with factory-preset narrower ranges available for safety applications
- No electricity required – The SMA element responds directly to water temperature, requiring no electrical connection or control signal
- 57-3 copper with nickel plating – Corrosion-resistant body for long-term potable hot water service
- Wide pressure range 0.03–1 MPa – Suitable from low-pressure gravity-fed through standard mains-pressure water supply systems
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HFT40017T-01 |
| Thermostatic Element Type | Shape memory alloy (SMA) |
| Body Material | 57-3 copper, nickel plated |
| Handwheel | ABS white silk-screen, 40mm |
| Connection | G3/4 internal thread (DN20) |
| Temperature Adjustment Range | 20–60°C (standard); 35–55°C / 40–50°C / 30–60°C (preset options) |
| Temperature Control Accuracy | ± 2°C |
| Working Pressure Range | 0.03 MPa – 1 MPa |
| Ideal Working Pressure | 0.1 MPa – 0.5 MPa |
| Cold Water Temperature Range | 5°C – 29°C |
| Hot Water Temperature Range | 30°C – 99°C |
| Primary Use | Water heater (domestic and light commercial) |
G3/4 TMV Options — SMA vs Wax at the Same Connection Size
| Model | Element Type | Accuracy | Long-term Stability | Best For |
|---|---|---|---|---|
| HFT30001 G3/4 | Wax cartridge | ± 2°C | Standard | Cost-effective domestic installation |
| HFT40017T-01 | SMA | ± 2°C | Premium — no wax degradation | High-use, long-service installations |
Application & Use Cases
- High-frequency domestic and light commercial hot water systems – Rental properties, guesthouses, and small commercial buildings where the TMV cycles many times daily and long-term calibration stability reduces the frequency of service visits
- Solar thermal hot water systems – Where high storage temperatures and significant temperature differentials place demanding thermostatic cycling demands on the element throughout the day
- Premium residential installations – Homeowners seeking the best available thermostatic element technology at the standard G3/4 connection size, with reduced maintenance requirements over the property’s ownership period
- Care homes and assisted living with G3/4 connections – Where the valve’s long-term accuracy stability reduces the risk of calibration drift that could affect safe water delivery to vulnerable residents between scheduled inspections
- All domestic water heater types – Compatible with electric storage, gas instantaneous, solar thermal, and heat pump water heaters with G3/4 outlet connections
Installation Notes
- Connect hot water supply to the hot inlet (H), cold water supply to the cold inlet (C), and mixed water outlet (M) using male G3/4 fittings with appropriate thread sealant
- Install isolation valves upstream of both hot and cold inlets
- Install a strainer on the cold inlet to protect the SMA element from grit and debris
- The valve performs optimally at 0.1–0.5 MPa
- Verify outlet temperature at the furthest fixture with a calibrated thermometer after installation before commissioning for occupant use
- Flush supply lines before installation to remove debris
Frequently Asked Questions
What is the difference between the HFT40017T-01 and the HFT30001 G3/4?
Both valves are G3/4 internal thread thermostatic mixing valves with identical connection size, temperature range, accuracy, and pressure specifications. The sole difference is the thermostatic element technology. The HFT30001 G3/4 uses a conventional wax cartridge — reliable and proven, suitable for the majority of domestic installations. The HFT40017T-01 uses a shape memory alloy element that provides the same ±2°C accuracy with superior long-term calibration stability and no wax capsule leakage risk. Choose the HFT40017T-01 when long-term performance consistency and reduced maintenance frequency are priorities over initial cost.
What is a shape memory alloy and why is it more durable than wax?
A shape memory alloy (typically nickel-titanium/Nitinol) undergoes a reversible solid-state crystalline phase transformation when heated or cooled through its transformation temperature. This transformation changes the alloy’s crystal structure, generating a precisely repeatable mechanical movement — the basis of SMA thermostatic actuation. Unlike wax, which transitions between solid and liquid phases and is contained in a sealed capsule that can develop micro-leaks over time, the SMA element is a solid metal component with no liquid phase and no containment requirement. The crystalline transformation can be repeated millions of times without fatigue, making SMA elements inherently more durable than wax capsules in high-cycle applications.
Can the temperature range be factory-preset?
Yes. OEM and project orders can specify factory-preset ranges of 35–55°C, 40–50°C, or 30–60°C that mechanically limit handwheel travel. Contact the Legom team to specify the required preset range when ordering.
OEM & ODM Customization
Legom supports OEM and ODM services for the HFT40017T-01 Memory Alloy Thermostatic Valve. Customization options include preset temperature range, connection size, body finish, and handwheel color. Contact us via WhatsApp or info@legomsmart.com.
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.
