Dublin 250 Series Rotary Unions – High Speed Coolant Transfer

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 of Dublin 250 Series Rotary Unions

Engineers design the Dublin 250 Series Rotary Union to provide exceptional sealing performance and mechanical stability in demanding fluid transfer applications. They primarily configure it for single-passage fluid handling, making it ideal for transferring coolant, air, or oil from a stationary source to a rotating component.

Single-Passage, High-Efficiency Design

In addition, our engineering teams develop the 250 Series featuring a compact, single-flow passage. Therefore, it is ideally suited for applications where transferring just one fluid is necessary, including spindle cooling and air actuation. Its efficient internal flow path reduces turbulence and pressure drop.

Mechanical Seal Technology

This series utilizes a balanced mechanical seal system, typically composed of carbon graphite against a hardened stainless steel mating surface. This design ensures low wear, high-pressure resistance, and leak-free operation, even during high-speed or high-load use.

High-Speed, High-Pressure Capability

The Dublin 250 Series supports rotational speeds up to 6,000 RPM and working pressures of up to 150 PSI (10 bar), depending on the media and installation conditions. It performs reliably in both stationary and dynamic operating modes.

Durable Construction Materials

Moreover, manufacturers construct the union using corrosion-resistant materials such as anodized aluminum housings and stainless steel shafts. As a result, it withstands prolonged exposure to coolants, oils, air, and water during extended operation.

Precision Ball Bearings

Equipped with precision angular contact ball bearings, the 250 Series ensures low-friction rotation and excellent axial and radial load handling. This is essential for maintaining long-term performance in high-speed or offset applications.

Compact & Lightweight Design

With its low-profile structure, the 250 Series can be easily integrated into tight machine envelopes, making it ideal for spindles, rotary actuators, or compact machine heads.

Applications of Dublin 250 Series Rotary Unions

Thanks to its precision design and robust construction, the Dublin 250 Series Rotary Union is ideal for a wide range of industrial applications requiring high-speed fluid transfer across rotating interfaces. Below are the most common use cases:

CNC Machining & Metalworking

Used in spindle cooling systems and tool coolant delivery, the 250 Series provides stable fluid transmission during high-speed drilling, milling, and tapping processes.

Precision Automation Equipment

Ensures reliable transfer of compressed air or lubricating oil in rotating machine heads, actuators, and pneumatic indexing tables, supporting smooth and synchronized automation.

Plastic & Rubber Molding

Used for controlled temperature fluid circulation in rotating molds or rotating platens. It maintains thermal stability and product quality in molding machines.

Textile Machinery

Supports air or steam transfer in rotating drying drums or textile winders, offering stable rotation under medium to high pressure.

Packaging & Printing Machines

In rotary labelers, slitters, or printing rollers, the 250 Series handles continuous coolant or vacuum transfer with minimal leakage, even at high cycle speeds.

Robotic Arms & Rotary Index Tables

Enables air or oil supply to end effectors or tools on robotic rotary axes, reducing the need for external tubing and improving operational efficiency.

The Dublin 250 Series Rotary Union is ideal for reliable large-scale air transfer applications. It offers efficient performance for industries needing consistent and durable air flow 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. Furthermore, leading manufacturers specifically rate select models to manage high-temperature fluids like thermal oil. These ratings ensure reliable performance under demanding industrial conditions.

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: Typically, our team processes orders within a standard lead time of 3-5 business days. Furthermore, we offer expedited shipping options to accommodate urgent delivery needs.