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REFRIGERANT LINE REVERSING VALVES
4-Way Reversing Valves
The DunAn 4 way reversing valve is a key component in HVACR systems. Its main function is to reverse the flow of refrigerant, allowing the system to switch between heating and cooling modes. In commercial refrigeration, the application of a Dunan 4-way reversing valve and its variants, DSF series, HT, and HP models, is essential for specific refrigeration setups, especially those that require dual-function heating and cooling.
4-way reversing valves allow systems to adapt to varous functions without additional equipment, reducing the cost for seperate heating and cooling systems, and therefore reducing energy and operational costs. High temperature and High pressure optimised reversing valves offer additional longevity in demanding environments.
To ensure accurate component selections we advise customers to contact us to discuss your application requirements.
Simplify Dual Functioning in Heating & Cooling Systems with Reversing Valves
Many commercial refrigeration systems, such as those in grocery stores or restaurants, need both cooling, to refrigerate products, and heating to defrost coils or maintain optimal storage room temperatures. The 4 way reversing valve simplifies switching between these functions.
DSF Series
The DSF series is the standard 4 way reversing valve from Dunan offering cost efficiency, reliability and practicality.
Used in conventional commercial refrigeration systems operating within typical temperature and pressure ranges.
The standard DSF series allows for external customisation tailored to the system and is particularly useful in systems where simplicity is valued over automation. The DSF's straightforward design is advantageous for maintenance and replacements, and when retrofitting older systems with external solenoid or pilot valves.
Suitable for standard refrigeration units in retail or food storage environments.
DSF (S) Series
The S in the DSF(S) Series stands for "Single Solenoid Pilot Valve) highlighting the unique feature; a built in solenoid actuator that controls the pilot valve, which directs the main valves operation for precise and reliable switching between heating and cooling modes.
This simplifies the system design by integarting the pilot control within the valve asssembly. This reduces the need for external control components ideal for saving space in tight system layouts.
The DSF(S) version is particularly beneficial for modern commercial refrigeration systems, where compact, efficient, and reliable components are essential for maintaining performance and reducing operational costs.
DSF Series for HT
Useful in commercial systems exposed to higher temperatures, such as:
- Industrial refrigeration units working in hot climates.
- Heat recovery systems that repurpose waste heat from refrigeration for space heating.
- Defrost systems requiring higher temperature refrigerants for effective operation.
DSF Series for HP
HP: High Pressure - Applied in systems using modern high-pressure refrigerants like R410A or R32, which are common in newer refrigeration designs due to efficiency and environmental standards.
Suitable for high-pressure systems in Industrial refrigeration where higher refrigerant pressures are essential for performance, or advanced commercial setups employing compact yet powerful systems.
Brass DSF Series for HP & HT
Using a brass DSF (High Temperature - HT or High Pressure - HP) version of the Dunan 4 way reversing valve is ideal for applications that require enhanced durability, chemical resistance, and performance under extreme conditions. Brass valves are specifically designed for use in demanding environments where other materials might fail or degrade.
Energy Efficiency
For commercial refrigeration systems where heating might also be required, for example, for frost prevention or climate control in a controlled storage area, reversing valves make this transition seamless.
Custom Systems
4 way reversing valves allow designers to integrate flexible refrigeration and heating setups in commercial environments, making systems adaptable to varying load demands.
Meet Diverse Demands in Heating & Cooling Systems with a complete DunAn Range
The Dunan DSF series offers a versatile lineup of 4 way reversing valves, tailored to meet the diverse demands of HVAC and commercial refrigeration systems. From the reliable standard DSF version, designed for cost-effective and flexible applications, to the advanced DSF(S) model, which integrates a solenoid for compact, efficient operation, each valve is engineered for performance and reliability. For specialised needs, the HT (High Temperature) and HP (High Pressure) variants deliver robust solutions, handling extreme conditions and modern high-efficiency refrigerants with ease. Whether optimising a heat pump or a large-scale industrial refrigeration system, the DSF range provides the perfect balance of durability, efficiency, and precision.
DSF Series - Standard
A standard range of 4 way reversing valves designed for conventional HVAC systems. Suitable for systems operating at typical temperature and pressure ranges. Widely used in residential and light commercial applications.
Cost Efficiency
The flexibility of allowing systems to switch between cooling and heating modes without needing separate equipment, reduces overall system costs and energy consumption.
Flexibility
A wide range of capacity and connection styles are available, including special design configurations for systems of heating mode as main function.
Simplicity & Reliability
Offers reliable instantaneous changeover under minimum pressure differential.
Ease of Maintenance
The straightforward design of Dunan reversing valves is advantageous for maintenance and replacement, especially when retrofitting older systems.
DSF Series
Contact our team on 01782 618 444 for the availability and costs of our DSF 4 way reversing valves.
| Model | Port | Kv | Connection | Operating Pressure Difference | System Driving Mode | ||
| D | E, S, C | Max. | Min. | ||||
| (mm) | (m3/h) | (in.) | (in.) | (MPa) | (MPa) | ||
| DSF-4-2203 | 8 | 1.7 | 5/16 | 3/8 | 3.5 | 0.25 | ON/OFF & Inverter |
| DSF-9-2230 | 11.1 | 3.4 | 3/8 | 1/2 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-11B-2230 | 11.5 | 4.4 | 1/2 | 5/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-11E-2201 | 11.5 | 4.4 | 3/8 | 5/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-20-2217 | 17.2 | 9.5 | 1/2 | 3/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-34-2291 | 20.9 | 18.1 | 3/4 | 7/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-34-2218 | 20.9 | 18.1 | 7/8 | 9/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-50-2211 | 24 | 19.9 | 7/8 | 9/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-70-2204 | 28.6 | 28.5 | 1 | 5/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-105-2100 | 34.5 | 39.1 | 5/4 | 3/2 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-140-2100 | 41 | 58.5 | 3/2 | 7/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-180-2100 | 46.4 | 70.4 | 3/2 | 17/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-210-2100 | 50 | 80.2 | 2 | 21/8 | 3.5 | 0.3 | ON/OFF & Inverter |
DSF S Series - Solenoid
The Dunan DSF (S) solenoid version brings precision and convenience to HVAC and refrigeration applications. With a built-in single solenoid pilot valve, this advanced model streamlines control by integrating key functionality directly into the reversing valve, reducing the need for external components. Its compact design and quick response make it an excellent choice for systems where space is limited but performance is critical.
Single Solenoid Pilot Valve
This unique feature, a built in solenoid actuator controls the pilot valve which directs the main valves operation for precise and reliable switching between heating and cooling modes.
Compact
The DSF (S) version is particularly beneficial for modern commercial refrigeration systems, where compact, efficient, and reliable components are essential for maintaining performance and reducing operational costs.
Simplifies Design & Maintenance
The DSF (S) simplifies the system design by integarting the pilot control within the valve asssembly. This reduces the need for external control componenst ideal for saving space in tight system layouts.
Stainless Steel DSF (S) Solenoid Series
Contact our team on 01782 618 444 for the availability and costs of our DSF (S) 4 way reversing valves.
| Model | Port | Kv | D | E, S, C | Max. | Min. | System Driving Mode |
| (mm) | (m3/h) | (in.) | (in.) | (MPa) | (MPa) | ||
| DSF(S)-9-2250M | 11.1 | 3.4 | 3/8 | 1/2 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF(S)-14H-2252M | 12.8 | 6.1 | 1/2 | 5/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF(S)-20-2001M | 15 | 7.7 | 1/2 | 3/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF(S)-20-2230C | 17.2 | 9.5 | 1/2 | 3/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF(S)-34-2201M | 18.1 | 11.3 | 5/8 | 7/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF(S)-34-2232C | 21.5 | 14.3 | 3/4 | 7/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF(S)-50-2207C | 24 | 19.9 | 7/8 | 9/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF(S)-70-2250C | 32 | 35.9 | 1 | 5/4 | 3.5 | 0.3 | ON/OFF & Inverter |
DSF Series - HT & HP
Engineered for rigorous environments, Dunan DSF High Temperature (HT) and High Pressure (HP) reversing valves are designed to ensure seamless operation under extreme conditions. The HT variant excels in high-temperature applications, making it the ideal choice for systems requiring enhanced thermal resilience, such as industrial heat pumps or defrost cycles in commercial refrigeration.
The DSF Series for HP variant is built to handle the elevated pressures of modern high-efficiency refrigerants, including R410A and CO₂, ensuring safety and durability in advanced systems.
With robust materials, superior engineering, and the reliability you expect from Dunan, the HT and HP valves are core components in more complex refrigeration system designed to perform at its best.
Material Composition
HT and HP 4 way reversing valves are made of materials that withstand higher thermal or pressure stresses compared to the standard DSF series.
Refrigerant Compatibility
HP models are tailored for high-pressure refrigerants, while HT models are suited for refrigerants used in high-temperature systems.
High Temperature Applications
Useful in commercial systems exposed to higher temperatures, such as:
- Industrial refrigeration units working in hot climates.
- Heat recovery systems that repurpose waste heat from refrigeration for space heating.
- Defrost systems requiring higher temperature refrigerants for effective operation.
High Pressure Applications
Applied in systems using modern high-pressure refrigerants like R410A or R32, which are more common in newer refrigeration designs due to efficiency and environmental standards.
Suitable for high-pressure systems in:
- Industrial refrigeration where higher refrigerant pressures are essential for performance.
- Advanced commercial setups employing compact yet powerful systems.
DSF Series for HT & HP Applications
Contact our team on 01782 618 444 for the availability and costs of our DSF (HT & HP) 4 way reversing valves.
| Model | Port | Kv | Connection | Operating Pressure Difference | Ps | System Driving Mode | ||
| D | E, S, C | Max. | Min. | |||||
| (mm) | (m3/h) | (in.) | (in.) | (MPa) | (MPa) | (MPa) | ||
| DSF-4-2261 | 8 | 1.7 | 5/16 | 3/8 | 3.1 | 0.25 | 4.9 | ON/OFF & Inverter |
| DSF-9-2261 | 11.1 | 3.4 | 3/8 | 1/2 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-11B-2261 | 11.5 | 4.4 | 1/2 | 5/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-11E-2261 | 11.5 | 4.4 | 3/8 | 5/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-20-2263 | 17.2 | 9.5 | 1/2 | 3/4 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-34-2262 | 20.9 | 18.1 | 3/4 | 7/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-50-2262 | 24 | 19.9 | 7/8 | 9/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-70-2601 | 26 | 25.7 | 1 | 5/4 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-105-2601 | 34.5 | 39.1 | 5/4 | 3/2 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-140-2601 | 41 | 58.5 | 3/2 | 7/4 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-180-2601 | 46.4 | 70.4 | 3/2 | 17/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-210-2601 | 50 | 80.2 | 2 | 21/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
Brass DSF Series
Using a brass DSF (High Temperature - HT or High Pressure - HP) version of the Dunan 4 way reversing valve is ideal for applications that require enhanced durability, chemical resistance, and performance under extreme conditions. Brass valves are specifically designed for use in demanding environments where other materials might fail or degrade.
Brass Against Standard DSF 4 Way Reversing Valves
Extreme Heat Resistance (HT)
Brass valves are better suited to withstand high temperatures compared to standard materials like steel or aluminum.
When reversing valves are exposed to hot refrigerant during defrosting or heating cycles, brass valves provide superior thermal stability. Systems operating in high ambient temperatures or requiring high-temperature refrigerants benefit from the thermal durability of brass.
Modern Refrigerants with High Pressure
Newer refrigerants such as R410A, R32, or CO₂ (R744) operate at higher pressures than traditional refrigerants like R22. Brass is more resilient to these pressures and reduces the risk of leaks or failures.
Large-scale systems with significant refrigerant load and pressure require components that can handle the increased mechanical stress.
Heat Recovery Systems: High-pressure systems that recycle waste heat from refrigeration for other processes benefit from the reliability of brass components.
Corrosive Environments
Brass is more resistant to corrosion when compared to steel making it ideal for coastal or marine environments with high humidty and salt exposure, or chemical laden environments.
Durability & Longevity
Brass provide excellent wear resistance, making it suitable for applications with frequent switching between heatinga nd cooling modes. This ensure a longer operational life in systems ecposed to fluctuating pressures and temperatures.
Brass DSF Series
Contact our team on 01782 618 444 for the availability and costs of our brass DSF 4 way reversing valves.
| Model | Port | Kv | Connection | Operating Pressure Difference | System Driving Mode | ||
| D | E, S, C | Max. | Min. | ||||
| (mm) | (m3/h) | (in.) | (in.) | (MPa) | (MPa) | ||
| DSF-4-2203 | 8 | 1.7 | 5/16 | 3/8 | 3.5 | 0.25 | ON/OFF & Inverter |
| DSF-9-2230 | 11.1 | 3.4 | 3/8 | 1/2 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-11B-2230 | 11.5 | 4.4 | 1/2 | 5/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-11E-2201 | 11.5 | 4.4 | 3/8 | 5/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-20-2217 | 17.2 | 9.5 | 1/2 | 3/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-34-2291 | 20.9 | 18.1 | 3/4 | 7/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-34-2218 | 20.9 | 18.1 | 7/8 | 9/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-50-2211 | 24 | 19.9 | 7/8 | 9/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-70-2204 | 28.6 | 28.5 | 1 | 5/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-105-2100 | 34.5 | 39.1 | 5/4 | 3/2 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-140-2100 | 41 | 58.5 | 3/2 | 7/4 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-180-2100 | 46.4 | 70.4 | 3/2 | 17/8 | 3.5 | 0.3 | ON/OFF & Inverter |
| DSF-210-2100 | 50 | 80.2 | 2 | 21/8 | 3.5 | 0.3 | ON/OFF & Inverter |
Brass DSF Series for HT & HP Applications
| Model | Port | Kv | Connection | Operating Pressure Difference | Ps | System Driving Mode | ||
| D | E, S, C | Max. | Min. | |||||
| (mm) | (m3/h) | (in.) | (in.) | (MPa) | (MPa) | (MPa) | ||
| DSF-4-2261 | 8 | 1.7 | 5/16 | 3/8 | 3.1 | 0.25 | 4.9 | ON/OFF & Inverter |
| DSF-9-2261 | 11.1 | 3.4 | 3/8 | 1/2 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-11B-2261 | 11.5 | 4.4 | 1/2 | 5/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-11E-2261 | 11.5 | 4.4 | 3/8 | 5/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-20-2263 | 17.2 | 9.5 | 1/2 | 3/4 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-34-2262 | 20.9 | 18.1 | 3/4 | 7/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-50-2262 | 24 | 19.9 | 7/8 | 9/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-70-2601 | 26 | 25.7 | 1 | 5/4 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-105-2601 | 34.5 | 39.1 | 5/4 | 3/2 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-140-2601 | 41 | 58.5 | 3/2 | 7/4 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-180-2601 | 46.4 | 70.4 | 3/2 | 17/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |
| DSF-210-2601 | 50 | 80.2 | 2 | 21/8 | 3.1 | 0.3 | 4.9 | ON/OFF & Inverter |