What Is a Rotary Joint?

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A rotary joint, also known as a rotary union, is a mechanical device that allows the transfer of fluids—such as steam, water, thermal oil, air, or chemicals—between a stationary component and a rotating part. These devices are widely used in industrial machinery where rotating drums, rollers, or spindles require fluid supply under pressure or temperature.

How Rotary Joints Work

The core function of a rotary joint is to maintain a secure and leak-free connection while enabling rotation. It typically consists of a housing, a rotating shaft or rotor, and a sealing mechanism. The seal must withstand pressure, temperature, and continuous friction while keeping the fluid contained within the system.

Modern rotary joints use various types of seals such as carbon, ceramic, or mechanical seals to ensure durability and long service life. Some joints are designed for single media (such as steam only), while others are multi-channel types capable of handling different fluids simultaneously without mixing.

Common Industrial Applications

Rotary joints are essential in a variety of industries:

• Paper manufacturing: To transfer steam or thermal oil to heated rollers.
• Steel & metallurgy: In continuous casting and rolling equipment.
• Textile machinery: For temperature control using thermal oil.
• Chemical processing: For transferring corrosive or high-pressure fluids.
• Printing & packaging: In drying systems and rotary cylinders.

Xiandai rotary union are engineered to meet the specific demands of each industry, with custom configurations available for extreme pressure, temperature, and rotational speed.

Why High-Quality Rotary Joints Matter

Low-quality or poorly matched rotary joints can lead to:

• Leaks and energy loss
• Equipment damage
• Downtime and maintenance costs

Xiandai’s rotary joints are built with precision and tested under real working conditions. With advanced CNC machining and proprietary sealing technology, we ensure maximum reliability and efficiency for every unit.

Xiandai’s Solutions

Shandong Xiandai Sealing Technology offers:

• High-speed and high-temperature rotary joints
• Multi-passage rotary unions
• Custom rotary joint solutions for specialized applications
• Technical support and product matching guidance

Whether you are upgrading existing equipment or developing a new system, our team can recommend the right rotary joint for your needs.