HFT33009Z-01 Open One-Way Temperature Limit Valve at Low Temperature
The Legom HFT33009Z-01 Open One-Way Temperature Limit Valve at Low Temperature is a G1/2 thermostatic one-way valve that opens when water temperature falls below the preset threshold and closes when temperature rises above it — functioning as a temperature-sensitive gate rather than a standard thermostatic mixing valve. Featuring a fully electroplated body and electroplated handwheel with an integrated water inlet and outlet joint, the HFT33009Z-01 is the premium-finish counterpart to the HFT33019Z-01, combining the same low-temperature opening function with a higher-specification surface treatment suited to premium OEM water heater products and visible installation locations.
Temperature adjustment range 20–60°C, control accuracy ±2°C, working pressure range 0.03–1 MPa, compatible with hot water inlet 30–99°C and cold water inlet 5–29°C. Manufactured from 57-3 copper with electroplating throughout the body and handwheel.
Key Benefits
- Low temperature opening function — gates flow based on temperature threshold – Opens when sensed water temperature falls below the preset threshold and closes when temperature rises above it, providing automatic temperature-based flow control without electrical connection or manual intervention. This is fundamentally different from a thermostatic mixing valve — it is a one-way gate, not a blending device
- Fully electroplated body and handwheel – Premium metallic electroplating on both the valve body and handwheel provides a high-quality, corrosion-resistant metallic surface finish throughout — not just on the handwheel as on other electroplated handwheel models. This is the highest-specification surface treatment in the Legom HFT thermostatic valve range
- Integrated water inlet and outlet joint – Inlet and outlet connections are integrated into the valve body assembly, reducing external fitting count and creating a compact self-contained unit suited to OEM water heater integration at G1/2
- ±2°C temperature control accuracy – Precise temperature threshold detection with ±2°C accuracy for consistent open/close behavior at the defined set point
- 20–60°C adjustment range – Wide set point range covering the full spectrum of domestic hot water temperature management requirements
- No electricity required – Self-acting thermostatic operation powered by the sensed water temperature alone
- 57-3 copper with full electroplating – Premium construction with metallic plating throughout for durable potable hot water service and premium appearance
- Wide pressure range 0.03–1 MPa – Covers gravity-fed through mains-pressure applications
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HFT33009Z-01 |
| Valve Type | One-way, low temperature opening, fixed temperature |
| Body Material | 57-3 copper, electroplated |
| Handwheel | ABS with electroplating |
| Connection | G1/2 internal thread (DN15) |
| Joint Type | Integrated water inlet and outlet joint |
| 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 (premium OEM integration) |
HFT33009Z-01 vs HFT33019Z-01 — Premium vs Standard Finish
| Parameter | HFT33009Z-01 | HFT33019Z-01 |
|---|---|---|
| Valve function | One-way low temp opening | One-way low temp opening |
| Body finish | Full electroplating | Natural color pickling |
| Handwheel | Electroplated metallic | Plain black ABS |
| Joint type | Integrated joint | External connector |
| Connection | G1/2 | G1/2 |
| Thermostatic performance | Identical — same accuracy, range, pressure | |
| Best for | Premium OEM, visible installs | Standard OEM integration |
Application & Use Cases
- Premium OEM water heater products requiring electroplated components – Where the water heater manufacturer’s product specification requires electroplated internal valves and connectors for a consistent premium metallic appearance throughout the assembly, and the one-way low temperature opening function is needed as part of the heater’s thermostatic management system
- Visible installation locations requiring premium finish – Where the valve is installed in a semi-exposed or visible location and the fully electroplated body and handwheel provide a metallic appearance that coordinates with premium plumbing fixtures in the space
- Hot water recirculation system control with premium specification – In H-type or similar recirculation systems where a temperature-actuated one-way gate valve is required and the installation specifies electroplated components throughout
- Solar thermal and heat pump system integration – Premium-specification solar thermal and heat pump water heater products requiring electroplated thermostatic control components for consistent product quality appearance
Installation Notes
- Confirm the valve’s control behavior before installation: it opens when temperature falls below the set point and closes when temperature rises above it — verify this is the correct function for your application
- Connect supply pipework to the integrated inlet joint and distribution to the integrated outlet joint using appropriate thread sealant on all G1/2 connections
- Install isolation valves upstream to enable servicing without system shutdown
- Handle the electroplated body and handwheel carefully during installation — avoid contact with thread sealant or pipe compounds on the electroplated surfaces
- The valve performs optimally at 0.1–0.5 MPa
- For OEM integration dimensional drawings and functional behavior documentation, contact the Legom technical team
Frequently Asked Questions
How does the HFT33009Z-01 differ from the HFT33019Z-01?
Both valves perform the same function — opening when water temperature falls below the preset threshold and closing when it rises above it. The difference is entirely in finish and joint type. The HFT33009Z-01 has a fully electroplated body and electroplated handwheel with an integrated joint, while the HFT33019Z-01 has a natural color pickled body with a plain black handwheel and external connector. Choose the HFT33009Z-01 for premium OEM products and visible installations requiring a metallic appearance throughout. Choose the HFT33019Z-01 for standard OEM integration where the natural pickled finish is acceptable.
What does “open one-way at low temperature” mean?
This valve is a one-way gate — it has a single flow path from inlet to outlet that is either open or closed based on the sensed water temperature. It opens (allows flow) when water temperature falls below the preset threshold, and closes (blocks flow) when temperature rises above the threshold. Unlike a thermostatic mixing valve that always allows flow while modulating the mix ratio, this valve fully blocks flow above the temperature threshold. This function is used in hot water recirculation systems, solar thermal circuits, and OEM water heater thermostatic management where flow through a specific path must be gated based on temperature.
Can the opening temperature threshold be customized?
Yes. The 20–60°C adjustment range allows the opening threshold to be set across a wide range. Factory-preset options for OEM orders include 35–55°C, 40–50°C, and 30–60°C. For OEM products requiring a fixed, non-adjustable threshold, the preset range can be mechanically locked. Contact the Legom team with your specific threshold requirement.
OEM & ODM Customization
Legom supports full OEM and ODM services for the HFT33009Z-01 Open One-Way Temperature Limit Valve. Customization options include fixed temperature threshold, electroplating color and finish, integrated joint specification, connection size, and body configuration. Contact us with your complete OEM requirements 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.
