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Ryan Liu
Ryan Liu
Ryan Liu is a technical sales specialist at JIERUI FLUID, providing tailored solutions to clients worldwide. His deep understanding of hydraulic systems helps customers achieve optimal performance and sustainability.

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What is the connection method of ISO 6164 Flare Flange with pipes?

Jan 13, 2026

The ISO 6164 flare flange is a crucial component in hydraulic systems, renowned for its reliability and high - performance sealing capabilities. As a leading ISO 6164 flare flange supplier, I'm well - versed in the connection methods of these flanges with pipes, which I'll elaborate on in this blog.

1. Understanding ISO 6164 Flare Flanges

ISO 6164 flare flanges are designed according to the international standard ISO 6164, which specifies the dimensions, materials, and performance requirements for flare flanges used in hydraulic systems. These flanges are widely used due to their ability to provide a leak - free connection under high pressure. They are commonly used in various industries, including construction, agriculture, and manufacturing.

2. Connection Methods

2.1. 37 - Degree Flare Connection

The most common connection method for ISO 6164 flare flanges is the 37 - degree flare connection. In this method, the end of the pipe is flared at an angle of 37 degrees. The flare flange has a corresponding 37 - degree seat. When the flange is tightened onto the flared pipe end, the two 37 - degree surfaces mate together, creating a metal - to - metal seal.

This type of connection is highly reliable because the metal - to - metal contact provides excellent resistance to leakage, even under high - pressure conditions. It is suitable for a wide range of hydraulic applications, from low - pressure systems to high - pressure systems with pressures up to several thousand psi. You can find more information about 37 Degree Flare Flange on our website.

The installation process of a 37 - degree flare connection involves several steps. First, the pipe end must be properly prepared. This includes cutting the pipe to the correct length and deburring the edges. Then, a flaring tool is used to create the 37 - degree flare at the end of the pipe. After that, the flare flange is placed over the flared pipe end, and the bolts are tightened evenly to ensure a proper seal.

2.2. SAE 37° Flare Flange with O - ring Seal

In some applications, an additional sealing element, such as an O - ring, is used in combination with the 37 - degree flare connection. The SAE 37° Flare Flange O - ring Seal provides an extra layer of protection against leakage. The O - ring is placed in a groove in the flange, and when the flange is tightened onto the flared pipe, the O - ring is compressed, creating a secondary seal.

This type of connection is particularly useful in applications where there is a risk of vibration or where the system requires a higher level of sealing reliability. The O - ring helps to absorb any minor misalignments between the flange and the pipe, reducing the likelihood of leakage.

2.3. Bolted Connection

ISO 6164 flare flanges are typically connected to pipes using bolts. The flange has holes around its perimeter, and the corresponding pipe fitting or another flange also has matching holes. Bolts are inserted through these holes, and nuts are tightened onto the bolts to secure the connection.

It is important to use the correct torque when tightening the bolts. Over - tightening can damage the flange or the pipe, while under - tightening can result in a loose connection and potential leakage. A torque wrench should be used to ensure that the bolts are tightened to the specified torque value, which is usually provided in the product documentation.

3. Advantages of ISO 6164 Flare Flange Connections

3.1. High - Pressure Resistance

One of the main advantages of ISO 6164 flare flange connections is their ability to withstand high pressures. The metal - to - metal seal in the 37 - degree flare connection provides excellent strength and durability, making it suitable for use in high - pressure hydraulic systems.

3.2. Leak - Free Performance

The combination of the 37 - degree flare and, in some cases, the O - ring seal ensures a leak - free connection. This is crucial in hydraulic systems, as even a small leak can lead to a loss of efficiency, environmental pollution, and potential safety hazards.

37flange-oring-337° Flare Flange

3.3. Easy Installation and Maintenance

ISO 6164 flare flange connections are relatively easy to install and maintain. The installation process mainly involves preparing the pipe end, placing the flange, and tightening the bolts. In case of maintenance or repair, the flange can be easily removed and replaced without the need for complex tools or procedures.

4. Considerations for Connection

4.1. Pipe Material and Size

The material and size of the pipe are important considerations when connecting ISO 6164 flare flanges. Different materials have different properties, such as strength and corrosion resistance. The pipe size must also match the flange size to ensure a proper fit. For example, a larger - diameter pipe may require a larger - sized flange to provide a secure connection.

4.2. Environmental Conditions

The environmental conditions in which the hydraulic system operates can also affect the connection. For example, in a corrosive environment, it may be necessary to use flanges and pipes made of corrosion - resistant materials. In high - vibration environments, additional measures, such as using O - ring seals or vibration - damping materials, may be required to ensure the integrity of the connection.

5. Quality Assurance

As a supplier of ISO 6164 flare flanges, we are committed to providing high - quality products. Our flanges are manufactured using advanced production techniques and strict quality control measures. We ensure that all our products meet or exceed the ISO 6164 standard requirements.

We also offer technical support to our customers. Whether you have questions about the connection method, installation, or maintenance of our flare flanges, our team of experts is ready to assist you.

6. Conclusion

The connection method of ISO 6164 flare flanges with pipes is a critical aspect of hydraulic system design and operation. The 37 - degree flare connection, with or without an O - ring seal, provides a reliable and leak - free solution for a wide range of applications. By understanding the different connection methods and considering factors such as pipe material, size, and environmental conditions, you can ensure the proper installation and long - term performance of your hydraulic system.

If you are in the market for high - quality ISO 6164 flare flanges or need more information about our products and connection methods, we encourage you to contact us for procurement and further discussions. We look forward to serving you and helping you find the best solutions for your hydraulic system needs.

References

  • ISO 6164: International standard for flare flanges in hydraulic systems.
  • Hydraulic System Design Handbook: A comprehensive guide to hydraulic system components and connections.
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