RF vs RTJ Flange: Which One Has Better Sealing Performance?

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RF vs RTJ Flange: Which One Has Better Sealing Performance?

15/04/2026

🔷 Overview of RF and RTJ flanges

In piping and industrial valve systems, flanges are essential components used to connect pipelines and ensure sealing performance.

The two most common types are:

RF (Raised Face flange)
RTJ (Ring Type Joint flange)

👉 Both are used in high-pressure systems, but their sealing performance is different.

⚙️ What is an RF flange?

An RF (Raised Face) flange has a slightly raised sealing surface and uses soft gaskets such as:

Spiral wound gasket
PTFE gasket
Graphite gasket

📌 Key features:

Most commonly used flange type
Easy installation and maintenance
Sealing depends on soft gasket compression
Suitable for medium to high pressure systems

👉 RF flanges are widely used in general industrial applications.

⚙️ What is an RTJ flange?

An RTJ (Ring Type Joint) flange has a machined groove that uses a metal ring gasket (oval or octagonal shape).

📌 Key features:

Extremely high sealing performance
Suitable for very high pressure (Class 600 – Class 2500)
Uses metal-to-metal sealing
Requires precise machining

👉 RTJ flanges are commonly used in oil & gas and critical services

📊 RF vs RTJ comparison

Criteria	RF (Raised Face)	RTJ (Ring Type Joint)
Sealing method	Soft gasket	Metal gasket
Sealing performance	Good	Excellent
Pressure rating	Medium – high	Very high
Cost	Lower	Higher
Installation	Easy	Complex
Applications	General industry	Oil & gas, high-pressure systems

🏭 When should you use RF flanges?

Choose RF flanges when:

✔️ General industrial systems

Water, steam, gas
HVAC systems
Industrial plants

✔️ Medium to high pressure systems

✔️ Easy maintenance is required

🏭 When should you use RTJ flanges?

Choose RTJ flanges when:

✔️ Extremely high-pressure systems

Offshore oil & gas
Refineries

✔️ Critical and hazardous applications

✔️ Zero-leakage requirements

❓ Which one seals better: RF or RTJ?

👉 RTJ provides better sealing performance than RF

Because:

RTJ uses metal-to-metal sealing
Gasket is compressed inside a machined groove
Less affected by pressure and temperature changes

However:

RF is sufficient for about 90% of industrial applications
RTJ is required only for high-end critical systems

⚠️ Common mistakes

Using RF in ultra-high pressure systems → risk of leakage
Using RTJ in simple systems → unnecessary cost increase
Using incompatible gaskets

🔥 Quick selection tips

👉 Standard industrial systems → choose RF
👉 Oil & gas / high-pressure systems → choose RTJ

🏁 Conclusion

RF and RTJ flanges are both important sealing solutions:

RF = economical, flexible, widely used
RTJ = maximum sealing, used for extreme pressure

👉 Choosing the correct flange helps:

Improve system safety
Prevent leakage
Optimize cost efficiency

📞 Contact Information

Phuc Minh Engineering Co., Ltd (PM-E) specializes in supplying flanges, valves, gaskets, and piping components meeting international standards.

🌐 Website: pm-e.vn
📧 Email: info@pm-e.vn
📱 Hotline: +84 907 450 506 – +84 902 720 814 – +84 979 737 351

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