Operating Principle
How a Non-Contact Clearance-Seal Rotary Union Works at High Speed
Follow the stationary stator, high-speed rotor, medium flow path, bearing support, and controlled 0.003 mm one-side radial clearance.
Rotary Joint Selection, Installation & Seal Guides
Use these practical resources to define operating conditions, compare seal structures, avoid common installation errors, and identify the information needed to select a model.
Start by Task
Choose the next engineering step
Begin with the question you need to solve, then move from general guidance to a model or application review.
Choose a Rotary Joint
Review passages, medium, maximum pressure, maximum speed, temperature, and mounting before narrowing the model.
Open the selection guide →Install the Rotary Joint
Check alignment, hose support, anti-rotation, air preparation, and startup conditions that can affect service life.
Review installation risks →Compare Seal Structures
Understand how O-rings, lip seals, and spring-energized PTFE seals differ by pressure, speed, medium, and friction.
Compare seal types →Review an Operating Problem
Share the model, medium, operating limits, installation details, and observed symptoms for an engineer-to-engineer review.
Contact an engineer →
Complete Guides
Rotary joint engineering resources
These four published guides explain the operating principle and the decisions most often needed before model selection, installation, and seal review.
Selection and Specification
How to Select a Pneumatic Rotary Joint: Five Parameters to Review
Use passage count, pressure, speed, medium compatibility, and mounting as an initial screen before the drawing and operating conditions are reviewed.
Installation and Commissioning
How to Install a Pneumatic Rotary Joint: Seven Common Risks
Review mounting, alignment, piping, filtration, lubrication, and commissioning conditions that can contribute to premature wear or leakage.
Sealing Technology
Rotary Union Seal Types: O-Ring, Lip, and Spring-Energized PTFE
Compare three seal structures by pressure, speed, medium, friction, and acceptable leakage behavior before selecting a configuration.
Practical Next Steps
Compare models, see real installations, and view production testing
Use these links to narrow the model, see rotary joints installed in real equipment, or understand how finished units are tested.
Compare Rotary Union Models
Compare passage count, pressure, speed, mounting, material, and typical applications to find the closest starting point.
Compare models →See Real Equipment Installations
See rotary joints installed in CNC fixtures, bottle-capping machines, and laser tube cutting rear chucks.
View installations →See the Production Testing Process
See how every finished pneumatic unit is leak-tested passage by passage with compressed air at 1.0 MPa before packing.
View the testing process →Need Help Choosing for Your Machine?
A model number, photo, or drawing is enough to start. If known, add the medium, pressure, speed, passage count, and mounting details.