Standard & Custom Rotary Unions


DSTI rotary unions (rotary joints) reliably seal and transfer fluid such as water, air, hydraulic oil, coolant, steam, and other media types from stationary sources to rotating parts.

Our rotary union products are used across a wide range of industries including factory automation, heavy equipment, machine tool, packaging, medical, oil and gas, defense, and aerospace.

We offer standard rotary union product lines grouped by function and feature exclusive sealing technology selected for compatibility to each application’s operating pressure, temperature, speed, media, and required service life.

If our inventory of standard products isn’t a fit for your project, we can provide a custom-tailored rotary union solution designed to meet your exact application’s requirements for operating performance, cost, and delivery - in fact, it’s what we do best! Our fluid sealing experts will assist with a solution that meets your needs, which may include making modifications to a standard product, providing improvement recommendations to an existing design, or developing a new prototype to your exact project’s specifications.

Rotary Union FAQs

What is a rotary union?

A rotary union (or swivel joint) is a device used to transfer fluid under pressure or vacuum from a stationary inlet to a rotating outlet, preserving and isolating the fluid connection. Learn more about What is a Rotary Union?

How do I choose a rotary union?

Proper selection of a rotary union solution requires details about your application's operating parameters including pressure, speed, media type(s), number of flow passages (channels), and connection size(s) / type(s). A good place to start your search is with our Standard Rotary Unions. If you are confident that a custom / modified solution is most likely required or need assistance in your selection, contact us to Get Started. Our experts are here for you.

Do you offer custom rotary unions?

Yes, it's what we do best! We can meet your exact fluid rotary union requirements from modifying our standard products to complete, custom design and manufacturing. For more information see Custom Solutions

What is your process for a custom rotary union solution?

First, contact us to Get Started. Our team will reach out to you to start learning more about your project's technical and delivery requirements. We will consider all aspects of your application and work together to develop the best solution. We typically start by evaluating our in-stock standard product options, reviewing our extensive library of custom rotary union designs, and examining a complete custom solution.

We will present a detailed proposal including proposed design, cost breakdown, and project timeline. You will be assigned a sales engineer and project manager so you know who to go to with any questions throughout the process. For more information see Custom Solutions

Do you offer compatible options for replacing another manufacturer's fluid rotary union?

Yes, we can cross reference other manufacturer's fluid rotary unions to find an equivalent solution. Contact us to Get Started

Can your standard rotary unions be modified to meet the requirements of my application?

We can modify our standard rotary unions to fit your needs. Custom modifications to our standard products are quite common and easier than you may think. Modifications include changes to housing / shaft dimensions and materials, seal types, mounting configurations, connection sizes and types, and flow passage configurations. For more information see Standard Rotary Union Modifications

Do you offer replacement seals and/or bearings for rebuilding your rotary unions?

Yes, seal and bearing kits are available for our rotary union products for on-location rebuilding and repair. Contact us to Get Started


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