Durable Single Passage Rotary Union for Smooth Pneumatic Rotation

Description

Product Overview

The Single Passage Rotary Union is an essential component for industrial systems requiring the transfer of air, water, hydraulic oil, or coolant between stationary and rotating parts. This rotary union is expertly designed to provide leak-free, low-torque, and high-speed rotation while maintaining a reliable seal under pressure. Built to serve a wide range of applications, this single-channel rotary joint offers excellent durability, precision performance, and effortless installation.

Unlike multi-passage rotary unions, the single passage design is optimized for transferring a single medium with maximum efficiency, making it ideal for pneumatic systems, hydraulic circuits, coolant delivery, and vacuum operations. With its self-supported swivel structure, balanced mechanical seals, and maintenance-friendly construction, this rotary union provides long-lasting service with minimal downtime.

Whether you are working in industrial automation, robotics, packaging, printing, textile machinery, CNC equipment, or fluid power systems, the Single Passage Rotary Union is engineered to meet the most demanding operational requirements.

How does the Single Passage Rotary Union work?

Technical Specifications

Specification	Details
Number of Passages	1
Max Air Pressure	600 PSI (40 BAR)
Max Hydraulic Pressure	5000 PSI (344 BAR)
Max Vacuum Pressure	28" Hg (90 kPa)
Max Operating Temperature	400°F (200°C)
Max Rotational Speed	400 - 500 RPM
Seal Material	Teflon-filled slipper seals, Backup O-rings
Shaft Material	Stainless Steel
Housing Material	Anodized Aluminum, Brass, or Stainless Steel
Connection Thread Types	1/8" NPT, BSP, Custom Options

Dimension	​Value (mm)
A	1/2"-14 NPT RH
B	1/2"-14 NPT
C	56.7
D1	113.3
E	33.9
F	22.2
G	12.7
H	28.5
J	83.1

Key Features – Single Passage Rotary Union

Single-Passage Design

Engineered with a single-flow channel, this rotary union efficiently transfers one medium—such as air, water, oil, or coolant—without risk of cross-contamination, ensuring smooth, focused operation in pneumatic and hydraulic systems.

Self-Supported Rotating Swivel Joint

The integrated self-supporting structure eliminates the need for external supports or braces, simplifying installation and ensuring stable, reliable rotation during continuous operation.

Radial Housing Connection

Designed with a radial port layout, the rotary union allows for easy, space-saving piping connections, making it ideal for compact equipment and tight installation spaces.

Balanced Mechanical Seals

Features precision-balanced mechanical seals that significantly reduce seal wear, extend service life, and provide superior protection against leaks, even under high-speed and high-pressure conditions.

Flexible Seal Combinations

Offers customizable sealing options, including carbon-graphite/hardened tool steel and carbon-graphite/silicon carbide to ensure compatibility with various media, operating speeds, and temperature ranges.

Felt Lubricator for Air Service

Equipped with a felt lubricator in the seal chamber specifically for air applications, which continuously releases a light film of lubricant to maintain seal integrity and minimize friction.

Grease Fitting for Easy Relubrication

Includes a convenient grease fitting that allows for periodic relubrication—recommended at just 3-5 drops per month—ensuring smooth performance and extended bearing life with minimal maintenance.

Low-Torque Design

The precision-engineered low-torque construction reduces rotational resistance, enabling smooth, energy-efficient operation, especially beneficial in high-speed and automated systems.

Weight-Optimized Construction

Manufactured with a focus on lightweight design to reduce system load and improve rotational balance, making it suitable for dynamic applications like robotic arms and rotary tables.

Durable Material Options

Constructed with an aluminum housing for corrosion resistance and weight reduction. The rotor is available in stainless steel or carbon steel (depending on the model), providing the strength and durability required for industrial environments.

Permanently Lubricated Ball Bearings

Features factory-sealed, permanently lubricated ball bearings that ensure long-lasting, maintenance-free rotation with minimal friction and excellent stability, even at high speeds.

Applications of Single-Passage Rotary Unions

🤖 Industrial Automation

Seamless air and fluid transfer to rotating actuators, robotic arms, and conveyors.

🔩 Hydraulic Systems

Efficiently transfers hydraulic oil in rotating cylinders and presses under high pressure and temperature.

💨 Pneumatic Equipment

Delivers stable air flow for pneumatic tools, hose reels, and air-powered machines.

🚗 Car Wash Systems

Supports water and detergent transfer in rotating spray arms and brushes.

🏷️ Packaging & Printing

Ensures continuous air or vacuum supply for rotary tables, spindles, and printing rollers.

🌬️ Renewable Energy

Used in wind turbine blade pitch control systems for reliable fluid transfer.

Why Choose Our Single Passage Rotary Union?

🏭 Over 10 Years of Industry Experience

Proven expertise in rotary union manufacturing and pneumatic solutions.

💰 Factory Direct Pricing

Competitive pricing with no middleman, maximizing your value.

⚙️ Fast Customization and Delivery

Quick, tailored solutions to meet your specific system requirements.

📞 Dedicated Technical Support

Professional, responsive assistance throughout your entire project.

✅ Strict Quality Control

Each product is rigorously tested to ensure leak-free, reliable performance.

About Customization

Due to the diversity of customer needs, standard rotary joint products are difficult to meet the needs of all customers. 65% of the company’s sales are basically non-standard customized products. At the same time, we have an excellent design and R&D team, which can ensure that customers’ non-standard customized products are completed in quality and quantity. Customers are welcome to customize with drawings/samples.

We need to know
1. Type of liquid or gas being transported (media)
2. Pressure (PSI)
3. Temperature (℉)
4. Speed ​​(RPM)
5. Shaft connection (thread size and type or flange size)
6. Media flow (GPM)
7. Flow channel – single flow or dual flow (such as dual flow: static or rotating siphon pipe or tube) To confirm the above information, please contact our pre-sales customer service, and we will assign a technician to connect with you.

FAQ

Q1: Can the Single Passage Rotary Union handle different media types?

A1: Yes, this rotary union can handle air, water, hydraulic oil, coolants, and vacuum. However, it is limited to transferring one medium at a time through a single passage.

Q2: Is this rotary union suitable for high-speed applications?

A2: Absolutely. The union is capable of handling speeds up to 3000 RPM, depending on the model, making it perfect for high-speed rotary equipment.

Q3: How often should I lubricate the rotary union?

A3: For optimal performance, we recommend adding 3-5 drops of grease per month via the integrated grease fitting.

Q4: Can I customize the rotary union for my specific application?

A4: Yes, we offer a range of customizable options, including seal material, pressure ratings, connection sizes, and housing materials.

Q5: Is this product compatible with vacuum systems?

A5: Yes, the Single Passage Rotary Union is specifically engineered to handle both positive pressure and vacuum applications efficiently.

Installation & Maintenance Tips

• Confirm thread compatibility before installation to ensure a secure, leak-proof fit.
• Avoid operating at maximum pressure and maximum speed simultaneously to prolong product life.
• Regularly inspect seals and bearings for wear, especially in continuous or high-speed applications.
• Use recommended lubricants for bearings to maintain low torque and smooth rotation.
• Consult with technical support for applications involving temperatures above 220°F (105°C) or unusual media.

Conclusion

Our Single Passage Rotary Union is the perfect solution for industries requiring dependable transfer of air, gas, or hydraulic fluids between stationary and rotating components. With its robust construction, advanced sealing technology, and versatile configurations, it delivers superior performance, durability, and efficiency. Whether you need a rotary union for pneumatic tools, hydraulic systems, or industrial automation, this product ensures smooth operation and long service life, backed by expert support and customization options.

Upgrade your machinery with our high-quality Single Passage Rotary Union today! Contact our sales team for custom sizes, technical consultation, or to request a quote tailored to your application.