Dublin 250 Series Rotary Unions – High Speed Coolant Transfer
Original price was: $280.00.$270.00Current price is: $270.00.
- Max Pressure (Air): 150 PSI
- Max Pressure (Vacuum): -13.75 PSI
- Max Flow Rate (Air): Up to 300 CFM
- Overall Length: Varies by model
- Rotor Connection: Various options available (e.g., G 1/4″-19)
- Operating Temperature: Up to 250°F (121°C)
Description
The Dublin 250 Series rotary unions are engineered for high-pressure hydraulic fluid transfer in applications such as variable pitch sheaves, power steering systems, and industrial machinery. Their balanced mechanical seals prevent leakage and resist wear even under fluctuating pressures and rotational speeds. The self-supported design allows for easy mounting with minimal space requirements, making them ideal for compact hydraulic systems.
Constructed with a lightweight aluminum housing and durable rotor materials, the 250 Series rotary unions offer excellent corrosion resistance and mechanical strength. The low torque design reduces mechanical stress on connected components, enhancing overall system reliability. Additionally, the inclusion of a felt oiler in the seal cavity and an optional relubrication feature ensures long-lasting seal performance, especially in air service environments.
This rotary union series is suitable for a range of hydraulic media, including oils and water-based fluids, and can be customized to meet specific industrial needs. Whether your application involves hydraulic oil transfer, clutch and drive systems, or high-speed rotational equipment, the Dublin 250 Series provides a robust, efficient solution.
Key Features & Benefits of Dublin 250 Series rotary unions
Robust Construction
Manufactured with high-strength stainless steel or anodized aluminum for corrosion resistance and mechanical durability.
Leak-Free Performance
Precision-engineered sealing technology ensures zero internal leakage, even under high-pressure and high-speed conditions.
Versatile Media Compatibility
Compatible with a wide range of fluids, including coolant, water, hydraulic oil, and compressed air.
Low-Maintenance Design
Equipped with long-life seals and bearings, reducing downtime and maintenance costs.
Compact & Lightweight
Optimized for space-constrained installations while maintaining maximum flow capacity.
Multiple Port Configurations
Available in single-passage and dual-passage rotary union designs to suit different system requirements.
Parameter | Description |
---|---|
Model Series | Deublin 250 Series |
Passage Types | Single / Dual Flow |
Operating Pressure | Up to 200 PSI (13.8 bar) |
Maximum Speed | Up to 3,000 RPM |
Temperature Range | -20°C to +120°C |
Seal Type | Balanced Mechanical Seal |
Media Supported | Water, Air, Coolant, Hydraulic Oil |
Connection Types | BSP, NPT, UNF, Flange Options |
Housing Material | Stainless Steel / Aluminum |
Shaft Material | Hardened Steel / Ceramic Options |

Applications of the Dublin 250 Series rotary unions
CNC Machining Centers
Reliable for coolant transfer during high-speed spindle operations.
Hydraulic Systems
Ideal for rotary hydraulic actuators and index tables requiring fluid transmission during rotation.
Packaging Machinery
Supports consistent fluid flow in rotating packaging components.
Automation Equipment
Used in robotic arms and rotary indexing tables for efficient media transmission.
Printing and Textile Machinery
Handles thermal oil and air in high-speed rotary dryers and rollers.
The Dublin 250 Series Large Rotary Union for Air is the perfect solution for industries requiring reliable and efficient air transfer systems. With advanced design, durable construction, and versatility across various media types, these rotary unions ensure optimal performance in any application.

FAQs
Q: Can the 250 Series be used for hot oil applications?
A: Yes. Select models are rated for high-temperature fluids like thermal oil.
Q: Are replacement seals available?
A: Absolutely. Seal kits are available for all standard models.
Q: What’s the lead time for bulk orders?
A: Standard lead time is 3-5 business days; expedited shipping options are available.