Modern automated machinery often needs to transmit multiple different media simultaneously while rotating. Ordinary single‑passage rotary unions can no longer satisfy complex working conditions. Multi‑passage rotary unions integrate several independent flow channels inside one unit, enabling simultaneous transmission of hydraulic oil, compressed air, cooling water, steam or other fluids between stationary and rotating parts. Without line twisting and winding, they greatly improve equipment stability for multi‑channel automation systems.

Industrial automated equipment often needs to deliver multiple kinds of media from stationary pipelines to continuously rotating components. Instead of installing several single‑passage rotary unions, engineers choose multi‑passage rotary union (multi‑channel rotary joint) as an all‑in‑one fluid rotary transmission solution.

A multi‑passage rotary union integrates 2 or more independent isolated flow passages inside one compact housing. Each channel works separately, transmitting hydraulic oil, compressed air, vacuum, cooling water, coolant or nitrogen at the same time, no cross‑contamination between different media. It realizes 360° unlimited continuous rotation for rotating tables, robot joints, machine tool spindles and rotary fixtures.