Description

High pressure rotary union is engineered to transfer hydraulic oil, water, coolant, compressed air, or other industrial media between stationary piping and rotating equipment while maintaining dependable sealing under demanding operating conditions. Compared with standard rotary unions, high-pressure models require stronger structural design, precision-machined sealing surfaces, and carefully selected bearing arrangements to withstand elevated pressure without compromising rotation or service life.

Our high-pressure rotary unions are developed for continuous industrial operation in applications where pressure stability, leak prevention, and equipment reliability directly affect production efficiency. Whether installed on machine tools, hydraulic fixtures, steel processing equipment, injection molding machines, or automated production systems, they provide smooth rotation and dependable fluid transfer under challenging conditions.

As a Chinese rotary union manufacturer with extensive OEM production experience, we manufacture high-pressure rotary unions for machinery builders, maintenance contractors, and industrial distributors worldwide.

Why High Pressure Requires a Specialized Rotary Union

Many fluid transfer systems operate at pressures that exceed the capabilities of conventional rotary unions. As pressure increases, sealing faces experience greater loading, bearings are subjected to higher forces, and even minor machining inaccuracies can result in leakage or premature failure.

A properly engineered high-pressure rotary union addresses these challenges through:

• Precision-machined sealing surfaces
• Optimized mechanical seal design
• High-strength housing materials
• Heavy-duty bearing support
• Pressure-balanced internal structure
• Stable concentricity during rotation

These design features help maintain reliable sealing performance throughout extended operating cycles.

Key Features

High Pressure Performance

Designed to handle high-pressure fluid transfer applications, ensuring optimal performance even under extreme operational conditions.

Flexibility in Motion

Our rotary union provides smooth, flexible rotational motion, supporting reciprocating and low-speed rotation and ensuring continuous fluid transfer without interruption.

Superior Wear Resistance

Manufactured with advanced materials, the rotary union offers high wear resistance, ensuring longevity and reducing the need for frequent maintenance.

Strong Support Capacity

With robust structural design, it offers exceptional load-bearing capacity, providing stability during high-pressure fluid transfer.

Sealing Technology

Featuring German OBO Seals, renowned for their high-quality sealing performance, this rotary union ensures reliable and consistent sealing under pressure, preventing leaks and maintaining system integrity.

Versatile Applications

Ideal for fluid transfer in industries such as oil and gas, automotive, machinery, and manufacturing, where high-pressure fluid movement is required.

Key Product Advantages

• Engineered for high-pressure operation
• Low-leakage sealing design
• Precision CNC-machined components
• Heavy-duty bearing arrangement
• Low rotational torque
• Long service life
• Corrosion-resistant materials
• Custom pressure ratings available
• OEM-compatible dimensions
• Worldwide technical support

Technical Specifications:

• Material: High-grade stainless steel (SS304/SS316) for corrosion resistance and long-lasting durability.

• Sealing System: German OBO Seals for superior leak prevention and reliable sealing.

• Pressure Range: Up to [insert pressure range] bar, ensuring high-pressure handling for demanding applications.

• Temperature Range: Operates effectively in a wide temperature range from [insert temperature range] °C, making it suitable for diverse operational environments.

• Rotational Speed: Optimized for low-speed and reciprocating movements, ideal for machinery and equipment that require continuous fluid transfer under rotation.

• Applications: Primarily used in high-pressure fluid systems, including hydraulic machinery, oil & gas pipelines, industrial cooling systems, and more.

Imperial Thread Comparison Table

Nominal Size	English Size	American Size	External Thread Diameter (mm)	Flow Diameter (mm)	Flow Capacity (m³/h)
2 inches (DN8)	1/4	19	~13	~11.5	6
3 inches (DN10)	3/4	19	~16.5	~15	9
4 inches (DN15)	1/2	14	~21	~18.5	12
6 inches (DN20)	3/4	14	~26.5	~24	16
1 inch (DN25)	1	11	~33	~30	22
1.2 inches (DN32)	1-1/4	11	~42	~39	30
1.5 inches (DN40)	1-1/2	11	~48	~45	35
2 inches (DN50)	2	11	~60	~57	48

Engineered for Demanding High-Pressure Applications

High-pressure rotary unions operate in environments where even a minor sealing failure can interrupt production or damage expensive equipment. For this reason, we focus on manufacturing consistency rather than simply meeting dimensional drawings.

Before production begins, our engineers review the customer’s application, including operating pressure, rotational speed, working medium, installation method, and available installation space. This evaluation helps determine the appropriate sealing structure, bearing configuration, and material combination for the expected operating conditions.

Instead of offering a single standard solution, we adapt the product design to suit the customer’s equipment whenever customization is required.

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From Machined Components to Finished Assembly

Every high-pressure rotary union is produced through a controlled manufacturing process inside our facility.

Key production stages include:

• CNC machining of the housing and shaft
• Precision finishing of sealing contact surfaces
• Thread machining and dimensional verification
• Bearing installation and alignment
• Mechanical seal assembly
• Rotational inspection
• Pressure testing
• Final cleaning and packaging

Maintaining tight machining tolerances throughout production helps ensure accurate alignment between rotating and stationary components, reducing internal wear and improving long-term sealing performance.

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Quality Verification Before Shipment

Each completed rotary union is inspected before it leaves our factory.

Our inspection procedures typically include:

• Critical dimension verification
• Thread and connection inspection
• Rotation smoothness evaluation
• Pressure retention testing
• Leakage inspection
• Surface finish examination
• Visual appearance inspection

Only products that complete these inspection procedures proceed to final packaging and shipment.

For customized projects, additional inspection reports or test records can be prepared according to customer requirements.

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Practical Experience Across Multiple Industries

Over the years, we have manufactured rotary unions for equipment operating under a wide range of industrial conditions, including high-pressure coolant systems, hydraulic machinery, steel processing equipment, automated production lines, and heavy-duty rotating machinery.

These projects have provided valuable manufacturing experience in selecting suitable sealing materials, optimizing internal flow paths, and improving component durability for different operating environments.

Rather than relying solely on theoretical design, our engineering team continuously refines product details based on production feedback and long-term equipment performance.

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Technical Support Throughout the Project

Selecting a high-pressure rotary union involves more than matching thread sizes or pressure ratings.

Our engineers assist customers with:

• Product selection
• Drawing review
• Connection verification
• Material recommendations
• Seal configuration
• Installation guidance
• Replacement for discontinued models
• OEM design optimization

This collaborative approach helps reduce installation errors and ensures that the rotary union matches the equipment’s actual operating conditions.

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Manufacturing Partner for OEM Equipment Builders

Many of our customers are machinery manufacturers who require stable quality, repeatable production, and reliable delivery schedules.

To support long-term cooperation, we provide:

• Customized machining based on drawings or samples
• Flexible production for small and large batch orders
• Material traceability throughout production
• Consistent machining standards across repeat orders
• Technical documentation and CAD support
• Stable export packaging for international transportation

Our objective is not simply to supply individual rotary unions, but to become a dependable manufacturing partner for industrial equipment manufacturers seeking consistent product quality and responsive engineering support.

Common Problems and Engineering Solutions

Problem 1 – Leakage Under High Pressure

Possible Causes

• Seal wear
• Incorrect seal material
• Excessive shaft runout
• Surface finish outside tolerance

Our Solution

We machine sealing faces with high precision and recommend seal materials according to media type, pressure, temperature, and rotational speed. Every sealing surface is inspected before assembly to reduce the risk of leakage.

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Problem 2 – Premature Mechanical Seal Failure

Possible Causes

• Pressure spikes
• Dry running
• Contaminated fluid
• Improper installation

Our Solution

Our engineers optimize seal combinations for each application and provide installation guidance to improve service life under demanding conditions.

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Problem 3 – Bearing Damage

Possible Causes

• High radial load
• Misalignment
• Insufficient lubrication
• Excessive vibration

Our Solution

Heavy-duty bearing arrangements and precision shaft alignment improve rotational stability and reduce bearing stress during continuous operation.

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Problem 4 – Pressure Loss

Possible Causes

• Restricted internal passages
• Poor flow design
• Incorrect rotary union size

Our Solution

Optimized internal flow channels minimize pressure drop while maintaining adequate flow capacity.

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Problem 5 – Frequent Maintenance

Unplanned shutdowns increase production costs and reduce equipment availability.

Our manufacturing process focuses on machining accuracy, material quality, and assembly consistency to reduce maintenance frequency and improve equipment uptime.

Typical Industrial Applications

CNC Machine Tools

High-pressure coolant systems improve chip removal, reduce cutting temperatures, and extend tool life. Rotary unions supply coolant directly through rotating spindles while maintaining stable pressure.

Hydraulic Clamping Systems

Rotary hydraulic fixtures require reliable oil transfer during continuous rotation. Our high-pressure rotary unions provide dependable sealing while minimizing pressure loss.

Steel Processing Equipment

Steel mills operate under harsh environments with high temperatures, vibration, and continuous production schedules. Durable rotary unions help reduce downtime caused by leakage or seal failure.

Injection Molding Machines

High-pressure cooling and hydraulic circuits maintain mold temperature and production consistency. Stable fluid transfer improves product quality and cycle efficiency.

Oil & Gas Equipment

Drilling equipment, rotary tables, and test systems require reliable high-pressure fluid transfer in demanding operating environments.

Heavy Industrial Automation

Automated production equipment often combines continuous rotation with hydraulic or coolant transfer. Compact rotary unions simplify piping while improving machine reliability.

Why Choose Our High-Pressure Rotary Union?

Our High Pressure Rotary Union is the ideal solution for industries that require high-performance fluid transfer under demanding conditions. With its superior wear resistance, seamless rotational movement, and German OBO Seals, it guarantees reliable, efficient, and long-lasting performance. Whether you are in hydraulic systems, oil and gas, or industrial equipment, this rotary union is engineered to meet the high standards of modern machinery and industrial systems.

Customer Application Example

A machine tool manufacturer required a replacement for imported high-pressure rotary unions used in through-spindle coolant systems. The original components experienced seal wear and long replacement lead times.

After reviewing spindle speed, coolant pressure, and installation dimensions, we supplied a customized rotary union with upgraded sealing materials and optimized bearing support.

The customer reported:

• Stable coolant delivery
• Reduced leakage
• Longer maintenance intervals
• Lower operating costs
• Improved equipment availability

Frequently Asked Questions

What media can this rotary union handle?

Depending on the seal configuration, it can transfer hydraulic oil, water, coolant, compressed air, and other compatible industrial fluids.

What pressure range is supported?

Pressure ratings depend on the model, media, rotational speed, and operating conditions. We recommend selecting the appropriate model based on your application requirements.

Can you customize the connection type?

Yes. BSP, NPT, Metric, SAE, and flange connections are available.

How do I choose the correct seal material?

Seal selection depends on pressure, temperature, media compatibility, and shaft speed. Our engineers will recommend the most suitable configuration.

Do you pressure-test every rotary union?

Yes. Every unit undergoes pressure and leakage testing before shipment.

Can your products replace imported rotary unions?

Yes. We manufacture OEM-compatible alternatives for many internationally used rotary union models and support custom replacement projects.

What information should I provide before requesting a quotation?

Please provide:

• Operating medium
• Pressure
• Temperature
• Rotational speed
• Flow rate
• Connection type
• Installation drawing (if available)

Do you support OEM manufacturing?

Yes. We provide OEM and ODM production, CAD support, prototype development, and customized manufacturing for industrial equipment manufacturers.