Rotary Unions

Rotary Union Products & Solutions from Weimer

Rotary unions are mechanical devices designed to transfer fluids, air, steam, coolant, or hydraulic media from a stationary source to rotating equipment. They provide a sealed connection between stationary supply lines and rotating components, enabling reliable media transfer while minimizing leakage and wear. Rotary unions are used in a wide range of industrial applications where continuous rotation and fluid transfer are required. Weimer supplies and stocks a broad range of rotary unions to support manufacturing, machining, processing, automation, and power transmission applications across a variety of industries.

Applications

Weimer supplies rotary unions for a wide range of industrial applications where fluids or gases must be transferred to rotating equipment.

Machine tools and CNC equipment
Printing and converting machinery
Paper and paper processing equipment
Steel, rubber, and plastics manufacturing
Packaging and automation systems
Rotary tables, indexing equipment, and winding machinery
Hydraulic, pneumatic, and coolant transfer applications

Key Features and Benefits

Rotary unions provide reliable fluid and media transfer while supporting continuous equipment operation in demanding industrial environments.

Enables fluid, air, steam, coolant, and hydraulic transfer to rotating equipment
Supports continuous operation while maintaining a sealed connection
Reduces leakage and media loss
Available in single-passage and multi-passage designs
Designed for a wide range of pressures, temperatures, and speeds
Available in a variety of materials including brass, stainless steel, aluminum, and specialty materials

Choosing the Rotary Union

Rotary union performance depends on proper sizing, media compatibility, and operating conditions. Weimer works with customers to identify solutions that meet performance and application requirements.

Media Type – Determine whether the application involves air, water, coolant, steam, hydraulic fluid, oil, or other media.
Number of Passages – Single-passage and multi-passage designs are available depending on media transfer requirements.
Operating Pressure – The rotary union must be rated for the application's maximum pressure requirements.
Operating Temperature – Media and environmental temperatures affect seal and material selection.
Rotational Speed – RPM requirements influence bearing design, sealing technology, and overall performance.
Connection Type – Available with a variety of thread, flange, and custom connection options.
Seal Material – Seal selection should be compatible with the media and operating conditions.
Material Construction – Available in brass, stainless steel, aluminum, and specialty materials to meet application requirements.

Types of Rotary Unions We Offer

Weimer offers rotary unions for a wide range of media transfer applications, including air, coolant, steam, water, hydraulic oil, thermal oil, and multiple media systems.

Air Rotary Unions

Designed for pneumatic actuation, blow-off, and compressed air applications. Available in single-channel, dual-passage, and multi-channel configurations to accommodate a variety of operating requirements.

Coolant Rotary Unions

Commonly used in machining centers and manufacturing equipment to deliver coolant to rotating spindles and tooling. Available in bearingless, bore-mounted, rotor-mounted, and multi-passage designs.

Steam Rotary Unions

Engineered for steam, condensate, hot water, and related heat transfer applications. Available in pressure joint and mechanical seal designs.

Hydraulic Oil Rotary Unions

Designed for hydraulic power transmission and actuation systems, including clutches, brakes, and rotating hydraulic equipment. Available in single-channel and multi-passage configurations.

Thermal Oil Rotary Unions

Used in applications requiring the transfer of heat transfer fluids, including paper and textile drying cylinders, rubber processing equipment, and industrial mixers. These unions are designed to withstand high temperatures.

Water Rotary Unions

Designed for water circulation, cooling, and heating applications in a wide range of industries. Available for general industrial use, high-pressure systems, continuous casting equipment, and food processing environments.

Multimedia Rotary Unions

Designed to transfer multiple media through a single assembly, including combinations of air, oil, water, coolant, and hydraulic fluids. Available in both low-speed and high-speed configurations.

Weimer is Your Source for Industrial Rotary Unions

Weimer is an authorized distributor for leading rotary union manufacturers worldwide, with a wide range of local inventory and industrial parts available across the United States for same-day pickup and delivery. We support customers throughout Wisconsin, Illinois, Minnesota, Michigan, Iowa, Indiana, North Carolina, South Carolina, Arkansas, Tennessee, South Dakota, Colorado, Texas, and beyond.

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Technical Expertise You Can Rely On

Weimer works directly with your team to deliver the support and resources needed for your application. From initial product selection to ongoing operation, we help ensure the right solution is in place to keep your equipment running reliably.

Application review and product selection guidance
Cross-referencing and sourcing for existing equipment
Access to a broad range of trusted manufacturers
Fast response to help minimize downtime
Reliable delivery across the U.S.

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Questions?

Our team is ready to help you. Contact us to learn more about our products and services.