High-Quality Dublin 21 Series Air Rotary Union Replacement

Description

Introducing our premium Dublin 21 Series Air Rotary Union replacement, engineered as a direct alternative to the original Deublin 21-001-101 model. Designed for low-speed pneumatic applications, this rotary union offers identical quality and performance at a fraction of the price, making it the perfect choice for cost-conscious buyers without compromising reliability.

Crafted with precision, our rotary union features a monoflow design optimized for air, hydraulic oil, and brake fluid transfer in low-speed operations. The robust construction includes an aluminum housing paired with a nickel-plated steel rotor, ensuring excellent corrosion resistance and long service life. A specially designed bearing enhances stability and durability, reducing downtime and maintenance costs.

Whether you need a rotary union for air clutches, pneumatic systems, or hydraulic applications, our product delivers seamless performance and longevity comparable to Deublin’s original units. It supports maximum operating pressures up to 10 bar (150 psi) and temperatures up to 121°C (250°F), suitable for a wide range of industrial environments.

Key Features of Dublin Air Rotary Union

Direct Replacement for Deublin 21 Series

Compatible with Deublin 21-001-101, ensuring easy integration without modifications.

Cost-Effective Alternative

Same high-grade materials and manufacturing standards at a significantly lower price point.

Monoflow Design for Optimal Performance

Minimizes turbulence in low-speed applications, enhancing efficiency in air and hydraulic systems.
Reduces energy loss and improves overall system stability. The Dublin 21 Series incorporates a monoflow design that minimizes turbulence and maximizes fluid transfer efficiency in low-speed environments. This innovation ensures consistent airflow and hydraulic performance, critical for applications such as rotary indexing tables and automated assembly lines. By reducing pressure drops and energy loss, the mono-flow configuration extends the operational lifespan of connected machinery while maintaining precise control over media flow.

Multi-Media Compatibility

Handles air, hydraulic oil, and vacuum media simultaneously, eliminating the need for multiple fittings
Ideal for complex industrial processes requiring diverse fluid management.

Durable Construction for Demanding Environments

Constructed with a lightweight aluminum housing and nickel-plated steel rotor, the Dublin 21 Series withstands harsh industrial conditions, including exposure to corrosive chemicals and extreme temperatures up to 250°F (121°C). The rotor’s 3/4″-14 NPT RH connection and housing’s 1/2″-14 NPT port ensure secure, leak-proof integration into existing pneumatic or hydraulic systems. This durability is further enhanced by widely spaced ball bearings that absorb lateral loads, reducing wear during continuous operation.

Versatile Applications Across Industries

In manufacturing, the Dublin 21 Series excels in robotic arms and pneumatic clamping systems, where alternating air pressure and precise motion control are paramount. Its ability to handle hydraulic oil at pressures up to 3,000 PSI makes it ideal for injection molding machines, where consistent fluid delivery ensures product uniformity. The union’s compact design also allows integration into confined spaces within automated packaging lines, reducing downtime for maintenance.

Heavy-Duty Construction

Lightweight aluminum housing with corrosion-resistant nickel plating on the steel rotor ensures longevity in a high-pressure environment.
Self-lubricating seals reduce friction and maintenance, extending service life.

Self-Supported Rotor Stability

Maintains consistent alignment during rotation, preventing leaks and ensuring smooth operation at speeds up to 3000 RPM.
Critical for applications requiring precise fluid control, such as robotics and automation.

Low Maintenance & Easy Installation

Requires only 3-5 drops of lubricant monthly, minimizing downtime
Standard NPT threads (3/4″-14 NPT RH rotor, 1/2″-14 NPT housing) ensure quick integration into existing systems.

Why Choose Our Dublin 21 Series Air Rotary Union Replacement?

Our product is crafted to meet or exceed the stringent standards of Deublin’s original rotary unions, offering exceptional durability and efficiency. By choosing our alternative, you gain a cost-saving solution that does not sacrifice quality or performance. This makes it an excellent choice for manufacturers, maintenance teams, and industrial users seeking high-quality air rotary unions without the premium price tag.

Applications

1. Automation & Robotics

Used extensively in robotic arms, pick-and-place systems, and pneumatic grippers for continuous air supply during motion.

2. Packaging Machinery

Ideal for rotary indexing tables and form-fill-seal machines where uninterrupted air flow is required for actuation and sealing.

3. CNC & Machine Tools

Supplies air to rotating tools and actuators in CNC spindles, rotary tables, and automated drilling systems.

4. Textile and Printing Equipment

Ensures reliable performance in rotating machinery where compressed air is used for tension control, rollers, and air brakes.

5. Medical & Laboratory Equipment

Used in automated sample handling or rotating air devices due to its clean operation and compact form factor.

Packaging & Warranty

Each unit is carefully packaged to prevent damage during shipping. We back our product with a quality guarantee and responsive customer support to ensure your satisfaction.

FAQ of Dublin Air Rotary Union

Q1: Can the Dublin 21 Series handle vacuum instead of pressure?

Yes, this rotary union can handle both positive pressure and vacuum systems efficiently.

Q2: How long does the seal last?

Under normal conditions, the seals can last up to 5 million rotations, thanks to their non-contact design.

Q3: Can I use it for fluids like water or oil?

This model is optimized for air and vacuum only. For liquids, we recommend the Dublin 31 or 45 Series rotary unions.

Q4: Does it require external lubrication?

No external lubrication is required unless otherwise specified in custom builds. It comes pre-lubricated for lifetime use.

Q5: Is it suitable for outdoor use?

While it can be used outdoors, protection against water ingress and dust is recommended for optimal performance.

Order Now

If you’re looking for a high-quality, affordable alternative to the Deublin 21 Series Air Rotary Union, our replacement product offers the perfect balance of performance, durability, and cost savings. Ideal for low-speed air and hydraulic applications, it is engineered to deliver reliable service and extend the life of your pneumatic equipment.

Contact us today for volume pricing or OEM customization options.