Dual Passage Rotary Union for Fluid Transfer Systems

Description

The Dual Passage Rotary Union is a high-performance rotary joint designed to simultaneously transfer two independent fluid or gas media between stationary and rotating equipment. Engineered for industrial automation, pneumatic systems, hydraulic machinery, and manufacturing equipment, this dual-channel rotary union ensures leak-proof, efficient, and continuous fluid transfer with minimal maintenance. Its compact design and robust construction make it ideal for applications requiring reliable dual media flow in limited space.

Our Dual Passage Rotary Union is specifically engineered for applications requiring the simultaneous transfer of two independent media, such as air, hydraulic fluid, or vacuum, between stationary and rotating components. Built with precision and using premium-grade materials, this rotary union ensures reliable operation, minimal leakage, and superior durability even under demanding conditions.

Whether you need to transfer compressed air, cooling fluids, or hydraulic oil in automated machinery, this dual-channel rotary joint provides a seamless, maintenance-friendly solution

Key Features & Advantages

Dual Independent Passages

Enables simultaneous transfer of two separate media streams (air, hydraulic fluid, coolant, or gas) without cross-contamination, ensuring system safety and operational efficiency.

Advanced Sealing System

Utilizes balanced mechanical seals and high-quality O-rings to provide superior leak resistance and long service life, even under high pressure and rotational speeds.

Durable Materials

Made from corrosion-resistant stainless steel and engineered polymers, suitable for harsh industrial environments and various fluid types.

High Pressure & Speed Capability

Supports pressures up to 7,500 PSI (515 BAR) and rotational speeds up to 500 RPM, depending on model specifications.

Flexible Connection Options

Threaded connections such as NPT, BSPP, or SAE-ORB, with optional shaft O-ring face seals for flush mounting, facilitating easy integration into existing systems.

Compact & Lightweight Design

Space-saving form factor reduces installation footprint while maintaining high flow efficiency and low torque operation.

Customization Available

Tailored solutions for specific pressure ratings, passage sizes, and media compatibility to meet unique industrial requirements

Applications of Dual Passage Rotary Union

Dual passage rotary unions are designed to transfer two separate media streams—such as different fluids, gases, or a combination of both—simultaneously through a single rotating connection. This makes them essential in complex industrial systems that require continuous rotation and multi-channel fluid or gas delivery without cross-contamination.

1. Hydraulic and Pneumatic Actuation in Industrial Machinery

Dual passage rotary unions are commonly used in automated equipment and CNC machines where one channel supplies hydraulic fluid for clamping or actuation, while the other channel returns fluid or delivers pneumatic pressure. This configuration enables efficient bi-directional flow control within a compact, rotating joint—eliminating the need for multiple swivel assemblies.

2. Blow Molding and Plastic Processing Equipment

In blow molding applications, one passage is used to transfer compressed air into the mold cavity, while the second channel may be used for cooling water or to exhaust air. The dual-channel design allows continuous mold rotation without disrupting fluid transfer, improving production speed and product consistency.

3. Tire and Rubber Manufacturing

Dual flow rotary unions are integrated into tire presses or rubber molding equipment, where high-temperature steam is injected through one passage for vulcanization, while the second passage handles condensate return. This ensures efficient thermal cycling and minimizes downtime for press operation.

4. Printing, Coating, and Paper Converting Machines

In high-speed printing or coating lines, one channel may supply ink, coating fluid, or coolant, while the second passage manages return flow or air supply. The rotary union supports continuous drum or roller rotation without leakage, maintaining print quality and process efficiency.

5. Tool Changers and Spindles in CNC Equipment

Dual passage rotary unions are used in machine tool spindles to deliver both coolant and lubrication simultaneously. One passage provides high-pressure coolant directly to the cutting zone, while the other allows oil mist or vacuum air to ensure clean and precise machining. This enhances productivity and extends tool life.

6. Winders, Reels, and Cable Equipment

In cable winding and paper converting systems, dual passage unions enable rotation while supplying hydraulic or pneumatic power to tensioning devices. Simultaneously, the second channel may deliver coolant, lubrication, or electrical signal transmission via integrated slip rings.

Why Choose the H Type Dual Passage Rotary Union?

1. Superior Sealing and Leak Prevention

The rotary union employs advanced sealing materials such as carbon graphite and silicon carbide, ensuring minimal leakage even under high pressure and temperature variations. This reduces downtime and maintenance costs, enhancing operational efficiency.

2. Dual Independent Flow Passages

Unlike single-passage rotary unions, the H Type design supports two completely independent flow channels. This allows for the simultaneous transfer of different media types—such as hydraulic oil and coolant—through one compact unit, optimizing space and simplifying piping layouts.

3. Robust Construction for Harsh Environments

Constructed from high-grade carbon steel or stainless steel, this rotary union withstands corrosion, abrasion, and mechanical stress. The black oxide finish on carbon steel models adds an extra layer of protection against wear and oxidation.

4. Flexible Installation and Integration

With multiple thread standards and shaft sizes, the H Type Dual Passage Rotary Union can be easily integrated into existing systems. Optional O-ring face seal glands facilitate flush mounting, improving sealing integrity and simplifying assembly.

5. High-Speed and High-Pressure Performance

Engineered to handle rotational speeds up to 500 RPM and pressures up to 300 bar, this rotary union meets the demands of modern industrial machinery, ensuring smooth and reliable fluid transfer without compromising performance.

FAQ

Q: Can the rotary union handle both air and hydraulic oil at the same time?

A: Yes, the dual passage design supports simultaneous transfer of air and oil in completely separate channels.

Q: Can I customize the connection threads?

A: Yes, we offer both NPT and BSP threading, and custom sizes can be produced upon request.

Q: What maintenance does this product require?

A: Minimal maintenance is needed thanks to our high-performance sealing and bearing system.

Conclusion

Our Dual Passage Rotary Union offers a reliable, efficient, and customizable solution for dual media transfer in rotating machinery. Designed with advanced sealing technology and robust materials, it meets the highest industrial standards for performance and durability. Optimize your pneumatic and hydraulic systems with this compact, leak-proof rotary union engineered for continuous operation and minimal maintenance.

Order with Confidence

Enjoy fast shipping, quality assurance, and dedicated customer support. Upgrade your rotating system today with our Dual Passage Rotary Union – engineered for performance, built to last.