Rotary unions are an integral component in many hydraulic systems, often being paired with slip rings. They allow the transfer of fluid from a stationary source to a rotating part. This ensures the integrity of the fluid and the machinery it serves. 

With BGB’s expertly designed rotary joints, you can expect reduced wear and tear, increased lifespan, and optimal fluid transfer capabilities. Manufactured to exceptional standards and meticulously tested, our rotary joints guarantee precision and reliability. 

Our rotary unions adapt to various pressures, making them the preferred choice for a wide range of industries. Their modular design means they can be tailored to specific needs, ensuring both compatibility and efficiency. 

To learn more about rotary unions and how they operate, check out our recent guide: What is a Rotary Union?



Our hydraulic rotary joints are highly versatile and can be used in a wide range of industries. Their adaptability highlights our commitment to designing products that seamlessly integrate into various sectors, enhancing efficiency and reliability. 

Discover just some of the industries and operations that benefit from our rotary unions:

  • Construction Machinery: Hydraulic rotary joints are often used in cranes to ensure smooth load lifting and unhindered turret rotations. Their integration ensures precision and stability in crane operations across construction sites. 

  • Wind Energy Systems: Rotary joints are used in wind turbines to deliver hydraulic fluid to the blade pitch actuators, ensuring optimal wind energy capture and the ability to adapt to changing wind conditions.

  • Excavators: Rotary joints are crucial for the movements of the boom and stick, precise bucket operations, and the smooth rotation of the cabin on its undercarriage. 

  • Transport: Hydraulic rotary joints are also pivotal in applications like railway systems, heavy-duty vehicular mechanisms, and aerospace systems for dependable fluid transfer in rotating components.

  • Wastewater: They also enable consistent and reliable fluid transfer in wastewater treatment plants, especially in rotating filtration and processing units.


Our flagship rotary unions suit most requirements. Our 4 port unit can have ports blocked off as needed; many applications only require 2 ports so the option to close off un-required ports not only provides the cost saving involved in designing a bespoke unit, but also gives peace of mind in future-proofing should requirements change later on. 

We also have customers who need larger more complicated systems where we custom design units, these may include options such as ultra-long service life journal bearing systems often seen in offshore wind turbines.

Choose BGB for rotary solutions that stand the test of time. Get in touch with our team today for more information.


Key Features

In the market for hydraulic rotary joints, we’ve consistently found poor practice in fundamentals of O-ring sealing and fluid flow dynamics, as well as little consideration for user interfacing or the size and form factor of the unit.  

With these flaws in mind, we decided to develop our own robust, well-engineered, compact rotary unions with high flow rate capabilities to ease the pain points identified.

Each of the following key features are meticulously crafted to elevate the performance, durability, and user experience:

  • Optimal Fluid Transfer: Ensuring smooth, consistent, and efficient fluid transfer even under high pressures.

  • Robust Construction: Crafted from premium materials to withstand demanding operational conditions. 

  • Long-lasting Performance: Advanced sealing technologies reducing wear and tear, and ensuring a longer operational life.

  • Easy Installation: Designed with user convenience in mind, ensuring quick and hassle-free installation.

Low Maintenance: Minimised leakage and superior design reduce the need for frequent maintenance.



Rotary Union / Joints


What is a Rotary Union?


Catalogue Products

2MW Rotary Unit + Fixing


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