BLOG & GUIDES

Rotary Union Knowledge Base

Practical engineering guides for buyers and maintenance teams.

Rotary Union Selection Guide: How to Choose the Right One

A 7-step spec process — media, pressure, speed, temperature, ports, passages and mounting — with a sizing table and seal material guide.

Saturated steam service explained — carbon seals, siphon and condensate return, and dryer/roll applications up to 180 °C.

What changes above 6,000 RPM — PV limits, seal face cooling, balance and CNC spindle applications.

How to match a Deublin model number to a compatible replacement — dimensional envelope, threads, seal kits and 40-70% savings.

250-500 bar rotating hydraulic service — multi-channel designs, seal stacks and applications.

Air and vacuum rotary joints for automation — seals, dual-passage options and selection.

Machine tools, paper, rubber, textile, hydraulics, packaging, food and energy — the duty each demands.

Continuous rotation vs slow swivel — sealing technology, cost, and which one your machine needs.

The 10-step checklist, failure signs, seal kit rebuilds and maintenance schedule by duty class.

Passage count explained — when one channel is enough, when you need 2, 4 or 6, and the cost trade-offs.

The complete guide — what a rotary union is, types by media, selection checklist, and service life.

Compare the four rotary union families on pressure, speed, seals and applications.

Saturated steam service with carbon seals and siphon designs for dryers and rolls.

Multi-channel high-pressure unions for rotary actuators, presses and test stands.

Aftermarket replacement unions built to Deublin dimensional envelopes — save 40-70%.