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REFRIGERANT LINE BALL VALVES
Ball Valves
Dunan FQ series ball valves are designed for exceptional durability and precision in refrigerant flow control, making them ideal for HVACR systems of all scales. Built to withstand high pressures and temperatures, these valves ensure reliable operation, and are compatible with a wide range of modern refrigerants. Whether you need robust isolation for maintenance, efficient flow management, or enhanced system safety, the FQ series delivers unmatched performance.
Read below for the full selection table and product data or get in touch for more indepth system technical advice.
Simple and Reliable, Bringing Ease of Operation & durability to HVACR Systems
Manually operated valves are used to control the flow of refrigerant within the system. It gets its name from the spherical ball inside the valve that has a hole through its center. When the handle of the valve is turned, the ball rotates to either align the hole with the flow path, allowing fluid to pass through, or block it, stopping the flow.
Isolation & Maintenance
FQ series ball valves provide reliable isolation of components in refrigeration systems for maintenance.
Flow Control
Ball valves feature a straight through open cavity offering large flow and little resistance.
System Safety
The FQ series of Dunan ball valves offer system safety through features like durability, precise flow control, and compatibility with various refrigerants. They are designed to enhance safety where higher temperatures are encountered.
Evacuation & Charging
Ball valves play a crucial role in ensuring safety during refrigerant evacuation and charging in refrigeration and air conditioning systems.
Why Use Ball Valves in Refrigeration?
Ball valves are valued for their robust construction, resistance to high pressure and temperature, and long lifespan. Their simple operation, typically requiring just a quarter-turn to open or close, makes them user-friendly and reliable in critical applications. They are also versatile, being compatible with various refrigerants and suitable for both liquid and vapor lines. For mechanically automatic alternatives, learn more about our solenoid valves.
FQ Series
The FQ series of ball valves offer bi-directional flow with low pressure drop making them suitable for applications where reverse flow is possible.
Operating Temperatures
- Medium Temperature: -30℃~+120℃
- Ambient Temperature: -30℃~+70℃
Applicable Relative Humidity: 95%
Operating Pressures
- Max. Operating Pressure: 4.9 MPa(DN4~DN20)
- Max. Operating Pressure: 4.5 MPa(DN25~DN75)
Compatible Refrigerants
R134a, R407C, R410A, R404A, R32 and R290
FQ Series
Without Access Port
| ODF Connection | Kv Value(1) | ||
| Model | Port Size (In) | Port Size (mm) | (m3/h) |
| FQ-110-DN4 | 1/4 | 6 | 1.66 |
| FQ-110-DN8 | 3/8 | 10 | 4.68 |
| FQ-110-DN10 | 1/2 | 12 | 6.73 |
| FQ-110-DN13 | 5/8 | 16 | 10.4 |
| FQ-110-DN15 | 3/4 | 19 | 15.7 |
| FQ-110-DN20 | 7/8 | 22 | 23.6 |
| FQ-110-DN25 | 9/8 | 28 | 43.8 |
| FQ-110-DN32 | 11/8 | 35 | 76.8 |
| FQ-112-DN40 | 13/8 | 42 | 98.5 |
| FQ-110-DN50 | 17/8 | 54 | 210.3 |
| FQ-110-DN65 | 21/8 | 67 | 346.6 |
| FQ-110-DN75 | 25/8 | 79 | 477.6 |
(1) Kv factor is defined as the cold-water flow in m3/h under a pressure drop of 1 bar and valve completely open.
With Access Port
| ODF Connection | Kv Value(1) | ||
| Model | Port Size (In) | Port Size (mm) | (m3/h) |
| FQ-116-DN4 | 1/4 | / | 1.66 |
| FQ-116-DN8 | 3/8 | 10 | 4.68 |
| FQ-116-DN10 | 1/2 | 12 | 6.73 |
| FQ-116-DN13 | 5/8 | 16 | 10.4 |
| FQ-116-DN15 | 3/4 | 19 | 15.7 |
| FQ-116-DN20 | 7/8 | 22 | 23.6 |
| FQ-116-DN25 | 9/8 | 28 | 43.8 |
| FQ-116-DN32 | 11/8 | 35 | 76.8 |
| FQ-118-DN40 | 13/8 | 42 | 98.5 |
| FQ-116-DN50 | 17/8 | 54 | 210.3 |
| FQ-116-DN65 | 21/8 | 67 | 346.6 |
| FQ-116-DN75 | 25/8 | 79 | 477.6 |
(1) Kv factor is defined as the cold-water flow in m3/h under a pressure drop of 1 bar and valve completely open.