Description

Reliable Hydraulic Rotary Union Solutions From China

Dann Hydraulic is a professional hydraulic oil rotary union manufacturer in China, specializing in the design and production of rotary unions for industrial machinery.

Our hydraulic rotary unions are designed for transferring hydraulic oil between stationary and rotating components while maintaining stable pressure, reliable sealing performance, and continuous operation.

We provide:

• OEM replacement rotary unions;
• customized hydraulic rotary union solutions;
• replacement according to drawings or samples;
• industrial rotary union manufacturing services.

For customers looking for alternatives to imported rotary unions, Dann Hydraulic provides cost-effective and reliable solutions with shorter delivery times and flexible customization.

What Is a Hydraulic Oil Rotary Union?

A hydraulic oil rotary union is a precision mechanical device that allows hydraulic oil to flow between a stationary supply system and a rotating machine component.

During machine operation, the rotary union maintains a sealed connection while the shaft continues rotating.

Unlike standard fixed connections, hydraulic rotary unions are designed to handle:

• high pressure;
• continuous rotation;
• industrial working conditions;
• demanding hydraulic applications.

They are widely used in equipment where hydraulic power needs to be transmitted through rotating parts.

Hydraulic Oil Rotary Union Working Principle

A hydraulic rotary union mainly consists of:

Rotary Housing

The housing provides mechanical protection and connects the rotary union with the machine system.

Common materials include:

• carbon steel;
• stainless steel;
• aluminum alloy.

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Rotating Shaft

The rotating shaft connects with the machine spindle or rotating component.

Precision machining ensures:

• smooth rotation;
• low vibration;
• stable operation.

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Mechanical Seal System

The sealing system is the core component of a hydraulic rotary union.

High-performance sealing materials are selected according to working conditions:

• Silicon Carbide (SiC);
• Tungsten Carbide;
• Carbon Graphite;
• Ceramic materials.

Reliable sealing helps reduce:

• hydraulic oil leakage;
• pressure loss;
• maintenance frequency.

OEM Hydraulic Rotary Union Replacement Solutions

Many industrial customers face challenges when using imported rotary unions:

• high replacement costs;
• long international delivery times;
• difficulty obtaining spare parts;
• expensive maintenance.

Dann Hydraulic provides compatible hydraulic rotary union replacement solutions based on:

• original model number;
• technical drawings;
• product samples;
• equipment requirements.

Our engineers can analyze your existing rotary union and provide a suitable replacement solution.

We support replacement for various international industrial rotary union applications.

Applications of Hydraulic Oil Rotary Unions

CNC Machine Tools

Hydraulic rotary unions are widely used in CNC equipment where hydraulic oil transmission is required during spindle or rotary axis movement.

Applications include:

• machining centers;
• rotary tables;
• automated processing equipment.

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Steel Processing Equipment

Steel production equipment requires rotary unions capable of operating under demanding environments.

Hydraulic rotary unions help maintain:

• stable hydraulic transmission;
• continuous operation;
• reduced equipment downtime.

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Construction and Heavy Machinery

Hydraulic rotary unions are used in:

• excavators;
• cranes;
• drilling equipment;
• rotating platforms.

They provide reliable hydraulic transmission during continuous movement.

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Industrial Automation Equipment

Modern automated systems often require compact and reliable rotary connections.

Hydraulic rotary unions support:

• robotic systems;
• rotating fixtures;
• automated production lines.

Why Choose Dann Hydraulic as Your Rotary Union Supplier?

Professional Manufacturing Capability

Dann Hydraulic provides:

• precision CNC machining;
• customized rotary union production;
• strict assembly processes;
• industrial quality control.

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Customized Design Service

Different machines require different rotary union specifications.

We can customize:

• dimensions;
• mounting structure;
• thread standards;
• number of passages;
• sealing materials.

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Quality Testing Before Shipment

Each rotary union can be tested according to customer requirements, including:

• pressure testing;
• leakage inspection;
• rotation performance testing.

This ensures reliable performance after installation.

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China Direct Manufacturer Advantage

Working directly with a Chinese rotary union manufacturer provides:

• competitive pricing;
• shorter production cycles;
• flexible customization;
• direct technical communication.

Manufacturing Hydraulic Oil Rotary Unions That Perform in Real Working Conditions

Hydraulic oil rotary unions are often installed in equipment that operates under continuous pressure, heavy loads, and demanding environments. Unlike standard fluid transfer components, they must withstand constant rotation while maintaining reliable sealing and stable hydraulic pressure.

From our experience working with equipment manufacturers, industrial distributors, and maintenance companies, we know that a rotary union’s service life is determined long before it reaches the customer’s machine. Material selection, machining accuracy, assembly procedures, and quality inspection all influence how the product performs after thousands of hours of operation.

At Dann Hydraulic, we manufacture rotary unions with a practical engineering mindset. Every production step is designed to improve reliability, minimize leakage, and ensure consistent performance in real industrial applications—not just during laboratory testing.

Hydraulic Rotary Union Replacement Process

Step 1: Provide Product Information

Send us:

• original rotary union model;
• equipment information;
• product photos;
• technical drawings.

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Step 2: Engineering Evaluation

Our engineers analyze:

• installation dimensions;
• working pressure;
• rotation speed;
• sealing requirements.

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Step 3: Customized Production

After confirmation, we manufacture the replacement rotary union according to your requirements.

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Step 4: Testing and Delivery

Before shipment:

• product inspection;
• performance testing;
• export packaging.

Frequently Asked Questions

Can you manufacture a replacement hydraulic rotary union?

Yes. Dann Hydraulic can manufacture replacement rotary unions according to original models, drawings, or physical samples.

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What information is needed for quotation?

Please provide:

• model number;
• application;
• pressure requirement;
• medium type;
• quantity.

Our engineers will recommend a suitable solution.

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Do you provide customized hydraulic rotary unions?

Yes. We provide OEM customization including dimensions, passages, materials, and sealing systems.

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Are hydraulic rotary unions suitable for high-pressure applications?

Yes. Hydraulic rotary unions are specifically designed for industrial hydraulic systems requiring stable pressure transmission.

Conclusion

Hydraulic oil rotary unions are essential components for industrial equipment requiring continuous hydraulic transmission during rotation.

Choosing the right manufacturer helps improve equipment reliability, reduce maintenance costs, and shorten replacement cycles.

Dann Hydraulic provides professional hydraulic rotary union manufacturing and OEM replacement solutions for global industrial customers.

Whether you need a standard hydraulic rotary union or a customized replacement solution, our engineering team can help you find the right product.