Description

Dann Hydraulic manufactures high pressure rotary union designed for transferring hydraulic oil and other industrial fluids between stationary pipelines and rotating equipment.

A high pressure rotary union, also called a high pressure rotary joint or swivel joint, allows continuous rotation while maintaining stable fluid transmission under demanding operating conditions.

Our high pressure rotary unions are used in:

• Hydraulic machinery
• CNC equipment
• Industrial automation
• Steel processing equipment
• Plastic machinery
• Special rotating systems

We provide standard and customized rotary union solutions according to pressure requirements, installation dimensions and machine operating conditions.

High Pressure Rotary Union Specifications

Final specifications depend on actual operating conditions, including pressure, speed, temperature and media.

How Does a High Pressure Rotary Union Work?

A high pressure rotary union connects stationary hydraulic piping with rotating machine components.

During operation:

• The housing connects to the fixed pipeline
• The rotor rotates with the machine shaft
• Internal sealing elements prevent fluid leakage
• Bearings support smooth rotation

This design allows hydraulic fluid transfer without restricting machine movement.

Why Choose a High Pressure Rotary Union?

Reliable High Pressure Sealing

High pressure applications require precise sealing design.

The sealing system must handle:

• Hydraulic pressure fluctuations
• Continuous rotation
• Mechanical vibration
• Temperature changes
• Long operating cycles

Dann Hydraulic selects sealing solutions according to:

• Working pressure
• Fluid type
• Rotational speed
• Operating temperature
• Duty cycle

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Precision Machined Components

High pressure rotary unions require accurate manufacturing.

Our production controls:

• Rotor concentricity
• Housing dimensions
• Thread accuracy
• Sealing surface finish
• Assembly tolerance

Precision machining helps improve:

• Leakage resistance
• Rotation stability
• Service life

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Designed for Industrial Environments

High pressure rotary unions may operate in challenging environments including:

• Dust
• Vibration
• Continuous operation
• Heavy industrial machinery

The correct structure and sealing configuration help maintain stable performance.

Typical Applications

Hydraulic Machinery

High pressure rotary unions are commonly used in:

• Hydraulic rotating equipment
• Hydraulic cylinders with rotation
• Industrial presses
• Special machinery

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CNC Machine Tools

Applications include:

• Rotary tables
• Machining centers
• Automated machining equipment
• Coolant and hydraulic systems

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Steel Processing Equipment

Used in:

• Continuous production lines
• Heavy-duty machinery
• Rolling equipment
• Industrial processing systems

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Plastic Processing Machinery

Applications:

• Injection molding machines
• Extrusion equipment
• Cooling systems
• Rotating rollers

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Automation Equipment

Suitable for:

• Rotary indexing systems
• Robotic equipment
• Customized production lines

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

Common High Pressure Rotary Union Problems

Fluid Leakage

Possible causes:

• Seal wear
• Incorrect pressure rating
• Shaft misalignment
• Poor installation
• Wrong sealing material

Solution:

Select the rotary union according to actual operating conditions instead of only matching the connection size.

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Short Service Life

Common reasons:

• Excessive pressure
• High rotational speed
• Contaminated hydraulic oil
• Vibration
• Incorrect model selection

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Pressure Loss During Operation

Possible causes:

• Internal wear
• Improper passage design
• Seal damage
• Incorrect installation

How to Select the Right High Pressure Rotary Union

Before selecting a model, please provide:

Working Pressure

Confirm:

• Normal pressure
• Maximum pressure
• Pressure fluctuation

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Fluid Type

Examples:

• Hydraulic oil
• Water-glycol
• Coolant
• Industrial fluid

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Rotational Speed

Provide:

• RPM
• Continuous or intermittent operation

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Installation Dimensions

Include:

• Shaft diameter
• Thread specification
• Mounting method
• Overall length

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Working Environment

Provide:

• Temperature
• Dust conditions
• Operating hours
• Machine type

Manufacturing and Quality Control

Reliable high pressure performance depends on manufacturing accuracy.

Our quality control includes:

Material Inspection

Checking:

• Raw materials
• Component quality
• Material consistency

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Precision Machining

Manufacturing control includes:

• CNC machining
• Thread processing
• Surface finishing
• Dimensional inspection

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Assembly and Testing

Inspection includes:

• Assembly checking
• Rotation testing
• Pressure testing
• Leakage testing

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Custom High Pressure Rotary Union Solutions

Standard products cannot meet every machine requirement.

Dann Hydraulic provides customized solutions including:

• Customized connection sizes
• Special shaft dimensions
• Different sealing structures
• Multi-passage designs
• OEM replacement models

Send your:

• Drawing
• Sample
• Existing model number
• Working conditions

Our engineers can evaluate the suitable configuration.

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 is a high pressure rotary union?

A high pressure rotary union is a mechanical device that transfers hydraulic fluid between stationary and rotating components while maintaining sealing performance under high pressure.

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What pressure can a rotary union handle?

The allowable pressure depends on:

• Design structure
• Size
• Sealing system
• Rotational speed
• Application conditions

Please provide your operating parameters for confirmation.

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Can you manufacture customized high pressure rotary unions?

Yes.

We manufacture rotary unions according to:

• Drawings
• Samples
• Machine requirements
• Installation dimensions

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Can you replace imported rotary unions?

Yes.

We provide replacement solutions based on:

• Original model
• Dimensions
• Working conditions
• Application requirements

Request a High Pressure Rotary Union Quote

Looking for a reliable high pressure rotary union manufacturer?

Send us your:

• Pressure requirements
• Media information
• Installation dimensions
• Application details

Dann Hydraulic provides OEM high pressure rotary joint solutions for industrial equipment worldwide.