Comprehensive Freeze Protection for Heat Pump Systems: From Standalone Valves to Integrated Assemblies
Engineered for Air-Source and Water-Source Heat Pumps. Prevent evaporator freeze-up, eliminate vacuum siphon risks, and ensure continuous operation in extreme cold with self-actuating technology.
Heat pump systems, particularly air-source units, face critical operational risks during winter: evaporator icing can lead to catastrophic copper tube bursts and efficiency loss. Furthermore, standard drainage methods often create a vacuum siphon effect upon shutdown, sucking residual water out of the system and leaving components vulnerable to secondary freezing.
We provide a tiered, professional solution matrix:
- Dual Protection (JQ Series): Integrated Freeze Valve + Vacuum Breaker to neutralize negative pressure risks.
- Intelligent Passive (ST Series): Integrated Freeze Drain Valve with a shut-off valve. No power required, minimizing water waste to the fullest extent.
- Plug-and-Play (LF Series): Highly compact, pre-assembled (Anti-freeze Assemblies) that simplify installation and minimize leak points.
No electricity required. Purely mechanical drive. Reliable performance from -30°C to +65°C.
Product Portfolio Breakdown
1. Enhanced Series: Freeze Protection with Integrated Vacuum Breaker
- Models: FP15GD-35-JQ
- Product Definition:
An advanced set combining the FP15GD-35 valve with a built-in Vacuum Breaker. When the valve opens and system pressure drops below atmospheric pressure, the breaker automatically admits air, breaking the siphon effect. This prevents the system from being completely drained or damaged by negative pressure. - Applications:
- Elevated Installations: Prevents gravity-induced negative pressure from emptying pipes after shutdown.
- Long-Distance Piping: Eliminates vacuum siphon risks in extended loop systems.
- Cost-Efficient Designs: Solves two safety issues with one unit, saving space and component costs.
- Key Benefits:
- Dual Safety Mechanism: Protects against both freeze-bursting and vacuum collapse/drainage.
- Simplified Piping: Eliminates the need for a separate vacuum breaker valve, reducing connection points and potential leaks.
- Compressor Protection: Prevents dry-running damage caused by accidental water loss.
2. Standard Freeze Protection Kit: Anti-freeze & Tee Joint
- Models: FP15GD-35-ST
- Product Definition:
The FP15-35-ST Series is a purely mechanical freeze protection device engineered specifically for heat pump water systems. It precisely monitors both system water temperature and ambient temperature without requiring electrical power or manual intervention. When the water temperature approaches the critical 1°C threshold, the valve automatically opens to initiate a “drip freeze protection” mode. As the temperature drops further, the valve automatically increases the drainage rate to balance heat loss. Once the water temperature rises, the flow rate decreases until the valve closes, achieving intelligent, closed-loop control throughout the entire process. - Applications:
- Freeze Protection for Heat Pump Water Systems: Suitable for various air-source heat pump water systems. It is particularly effective during unexpected system shutdowns or power outages, preventing equipment damage caused by the expansion of freezing water in outdoor piping and heat exchangers.
- Outdoor Low-Temperature Environments: Designed for installation outdoors where it can directly sense the minimum ambient temperature. It ensures effective operation even in extreme cold weather (as low as -30°C).
- Key Benefits:
- Zero Energy Consumption & Eco-Friendly: Driven entirely by a temperature-sensitive bulb (thermal actuator), it requires no power source and incurs no operating costs, aligning perfectly with energy-saving and environmental principles.
- Intelligent Variable Flow Control: Features automatic modulation capabilities ranging from “dripping” to “high-flow drainage.” This ensures effective freeze protection while minimizing water wastage to the greatest extent possible.
- Online Replacement Without Pressure Release: Featuring a unique isolation valve design, the front-end valve automatically closes during disassembly if the freeze protection valve needs replacement. This maintains system pressure and eliminates the need to drain the entire system.
- Wide Temperature Range Adaptability: Operates stably in ambient temperatures ranging from -30°C to 65°C, with a maximum pressure rating of 0.6 MPa.
3. Integrated Series: Compact Heat Pump Anti-Freeze Assembly
- Model: LF15-35-JQ
- Product Definition:
A highly integrated, pre-assembled unit that consolidates the freeze valve, vacuum breaker, strainer, isolation valves, and fittings into a single compact module. Factory-tested and calibrated for immediate deployment. - Applications:
- OEM Integration: Ideal as a standard accessory installed directly inside or at the interface of heat pump units.
- Rapid Retrofit Projects: Replaces complex piping assemblies instantly, drastically reducing on-site labor.
- Space-Constrained Environments: Compact footprint saves valuable equipment room space.
- Key Benefits:
- Maximum Installation Efficiency: Plug-and-play design reduces on-site welding/threading work by over 80%.
- Zero Leak Risk: Factory assembly eliminates errors associated with field installation.
- Maintenance Ready: Includes an integrated strainer to protect the valve core from debris; simplifies overall maintenance.
- Professional Aesthetics: Industrial-grade design enhances the overall quality perception of the heat pump unit.
Industry Applications & System Scenarios
| Industry Sector | Typical System Scenario | Recommended Solution | Core Pain Point Solved |
|---|---|---|---|
| Residential/Commercial Heating | Air-Source Heat Pump (Hydronic Floor Heating + DHW) | FP15GD-35-JQ, LF15-35-JQ | Evaporator freeze risk during night shutdown in extreme cold; limited installation space. |
| Industrial Process | Industrial Heat Pump Chillers | FP15GD-35-JQ | Vacuum siphon effects in large piping networks; protection of expensive industrial exchangers. |
| Pool Heating | Air-Source Pool Heat Pumps | FFP15GD-35-JQ | Seasonal shutdown or night-time freeze protection; cost-sensitive projects. |
| Aquaculture | Temperature-Controlled Farming Heat Pumps | FP15GD-35-ST | Critical need for continuous operation; any freeze failure could result in livestock loss. |
Why Choose Our Heat Pump Solutions?
- Self-Actuating Mechanical Intelligence
- No power, batteries, or controllers required. Operates reliably via wax thermal expansion, even during power outages in blizzard conditions.
- Proprietary Vacuum Breaking Technology
- Specifically addresses the “shutdown negative pressure” issue unique to heat pumps. The JQ/ST/LF series offer built-in protection that standard valves cannot match.
- Minimized Operational Costs
- Water Saving: Opens only at critical temperatures with minimal discharge volume.
- Energy Saving: Eliminates the need for energy-intensive electric trace heating.
- Labor Saving: The LF series modular design significantly reduces installation man-hours.
- Robust Durability in Harsh Environments
- Brass construction withstands freeze-thaw cycling fatigue.
- Designed to handle common pressure fluctuations and water hammer in heat pump loops.
- Flexible OEM Support
- Available as individual valves or complete assemblies, perfectly adapting to heat pump manufacturers’ assembly line requirements.
Technical Specifications Comparison
| Feature | FP15GD-35-JQ (Vacuum Breaker Set) | FP15GD-35-ST | LF15-35-JQ (Compact Assembly) |
|---|---|---|---|
| Opening Temp | 1°C ± 1°C | 1°C ± 1°C | 3°C ± 1°C |
| Closing Temp | 4°C ± 1°C | 4°C ± 1°C | 4°C ± 1°C |
| Vacuum Breaker | Integrated | No | Integrated |
| Integrated Water Shut-off Valves | Yes | Yes | Yes |
| Configuration | Valve Set | Valve Set | All-in-One Assembly |
| Connection Size | Male 1″, Male 1 1/4″, Male 1 1/2″ | Male 1″, Male 1 1/4″, Male 1 1/2″ | Male 1″ |
| Primary Material | Brass | Brass | Brass |
| Ideal Use Case | Elevated/Long Loop Protection | Elevated/Long Loop Protection | OEM Integration / Rapid Install |
Whether for OEM integration or engineering retrofits, we have the matching freeze protection solution.
Download detailed technical manuals and request an OEM partnership quote today.