DN Rotating Joint – Double-Flange High-Pressure Hydraulic Universal Swivel Joint

1. Product Overview

The DN Rotating Joint (also known as a double-flange high-pressure hydraulic universal swivel joint) is a critical connecting component for rigid piping systems. Its core function is to solve the problem of rigid pipe connections that cannot move freely, allowing the connected pipes to achieve 360° rotation or swing within a certain angle.

Key Features

• Universal Flexibility – Adds a "universal joint" to the piping system, allowing both media transmission and flexible movement.

• Double-Flange Structure – Both ends use flange connections, ensuring rigid connection, reliable sealing, and easy installation/disassembly.

• High Pressure Resistance – Withstands working pressures from 3.0 to 31.5 MPa.

• Wide Temperature Range – Suitable for temperatures from -30°C to +200°C.

• Various Media – Applicable to hydraulic oil, water, air, steam, and other media.

Typical Applications

Internal Structure & Sealing

• Bearing Support – Precision bearings or balls ensure smooth rotation and withstand pipe loads and bending moments.

• Sealing System – High-quality seals (e.g., Parker brand or special rubber) for reliable sealing.

• Material Options:

  • Carbon Steel – Cost-effective, high strength, suitable for general industrial applications.

  • Stainless Steel (304/316L) – Acid and corrosion resistant, suitable for seawater, chemicals, and corrosive media.

2. Detailed Flange Standards

DN Rotating Joints are flanged on both ends. The choice of flange standard directly determines compatibility with your piping system. The three major flange standards are fully described below.

2.1 GB Flange (Chinese Standard – First Choice for China Market)

Suitable for projects in mainland China or those designed to Chinese standards.

2.1.1 Flange Type Breakdown

2.1.2 Sealing Face Types

2.1.3 Dimension Example (Plate Flat Welding Flange GB/T 9119 PN4.0 MPa)

Note: Dimensions in mm. Refer to GB/T 9119 for complete specifications.

2.2 ANSI/ASME Flange (North America & International Projects)

Suitable for the North American market, international petrochemical projects, and export equipment.

2.2.1 Pressure Ratings

2.2.2 Sealing Face Types

• RF (Raised Face) – Most common, suitable for general applications

• RJ (Ring Joint) – For high-pressure, high-temperature, with metal ring gasket

• FF (Flat Face) – For low-pressure, cast iron flange connections

2.2.3 Dimension Example (ASME B16.5 Class 150)

Note: Dimensions in mm. Based on ASME B16.5.

2.3 DIN Flange (European & Middle East Markets)

Suitable for Europe, the Middle East, Africa, and parts of Southeast Asia. Follows DIN EN 1092-1 (replaces the older DIN 2501 series).

2.3.1 Common Types

2.3.2 Pressure Ratings

2.3.3 Dimension Example (DIN EN 1092-1 Type 11 PN16)

2.4 Comparison of Flange Standards

⚠️ Important: Bolt hole dimensions are NOT interchangeable between these three standards. You must specify the correct standard when ordering.

3. Selection Guide

Step 1: Determine Operating Parameters

Step 2: Select Flange Standard

Choose based on project location and existing equipment:

Step 3: Select Flange Type & Sealing Face

Based on pressure rating:

Step 4: Select Material

Step 5: Selection Checklist

Please confirm the following when ordering:

1. □ Nominal diameter: DN______

2. □ Working pressure: ______ MPa

3. □ Working temperature: ______ ℃

4. □ Media type: ______

5. □ Flange standard: GB / ANSI / DIN

6. □ Flange type: PL / SO / WN

7. □ Pressure rating: PN______ / Class______

8. □ Sealing face type: RF / FF / RJ / Other

9. □ Flange material: Carbon steel / 304 / 316L

10. □ Custom non-standard: Yes / No

4. Customization Options

If standard models cannot meet your requirements, manufacturers typically support non-standard customization:

• Size customization – DN20 up to DN800 or larger

• Configuration customization – Straight, 90° elbow, 180° U-shape, and other special configurations

• Multi-function composite – Combined delivery of air, liquid, oil, and other media

• Multi-standard adaptability – One rotating joint compatible with GB, ANSI, DIN, and other flange standards

5. Summary

The DN Rotating Joint (Double-Flange High-Pressure Hydraulic Universal Swivel Joint) is a reliable solution for pipe swivel connections. Focus on three key points when selecting:

1. Operating Parameters (pressure, temperature, media) – determines the product grade

2. Flange Standard (GB/ANSI/DIN) – determines interface compatibility

3. Flange Type & Sealing Face (PL/SO/WN, RF/FF/RJ) – determines connection reliability

If you need further assistance with selection, please provide your pipe size (DN), working pressure (MPa), and media type, and I can give more specific recommendations.

Let me know if you need this DN Swivel Joint With BOTH ENDS Flange connction.

Contact information:

Annie Ben

Focus Machinery Rotary Joint 

WhatsApp/WeChat 0086 13869496275

Email: annie@focusesmachinery.com

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Company：Shandong Focus Machinery Co.,Ltd.

Contact: Annie Ben  <Sales Director>

Tel/WeChat: 0086-138-6949-6275

WhatsApp/Facebook: 0086-138-6949-6275

Email: annie@focusesmachinery.com

Website: https://focusesmachinery.com/

Made In China Site：https://membercenter.made-in-china.com/

Alibaba: https://china-focus.en.alibaba.com/

Add: No. 988 Xingteng East Road, Shannan Street, Zaozhuang, Shandong, China