So sánh các loại bề mặt làm kín của mặt bích: RF, FF, RTJ, MFM, TG

Flange Facing Types Explained

The flange facing (sealing surface) is critical for creating a leak-tight joint. Different facing types are designed for specific pressure ranges, temperatures, and sealing requirements.

Kỹ thuật nâng mặt (RF)

Most Common Type

• Raised sealing surface (1.6mm or 6.4mm height)
• Concentric or spiral serrations for gasket grip
• Suitable for Class 150-2500
• Works with soft, semi-metallic, and metallic gaskets
• Ứng dụng: General service, oil and gas, chemical processing

Mặt phẳng (FF)

Full Surface Sealing

• Entire flange face is sealing surface
• Requires full-face gasket
• Limited to Class 150 and Class 300
• Prevents flange bending under bolt load
• Ứng dụng: Low-pressure water, cast iron flanges, plastic-lined systems

Khớp nối dạng vòng (RTJ)

High Pressure Metal-to-Metal Seal

• Groove for metal ring gasket (oval or octagonal)
• Metal-to-metal contact for superior sealing
• Suitable for Class 600 and above
• Handles extreme temperatures and pressures
• Ứng dụng: High-pressure steam, oil and gas wellheads, refineries

Khuôn mặt nam-nữ (MFM)

Self-Aligning Sealing

• One flange has raised male portion, other has recessed female
• Gasket sits in female recess for better alignment
• Reduced gasket blowout risk
• Ứng dụng: Pump and valve connections, heat exchangers

Tongue-Groove Face (TG)

Premium Sealing Performance

• Tongue on one flange fits into groove on mating flange
• Excellent gasket containment
• Superior sealing for hazardous media
• Higher cost due to precision machining
• Ứng dụng: Toxic gases, high-pressure hydraulic systems

Facing Selection Guide

Facing Type	Pressure Range	Nhiệt độ	Cost
Mặt phẳng (FF)	Low (Class 150-300)	Trung bình	Low
Kỹ thuật nâng mặt (RF)	Medium-High (Class 150-2500)	Wide	Medium
MFM	Medium-High	Wide	Medium-High
TG	High	Wide	High
RTJ	Very High (Class 600+)	Extreme	High

Khả năng tương thích của gioăng

• RF/FF: Non-asbestos, graphite, PTFE, spiral wound
• RTJ: Soft iron, stainless steel, Inconel ring gaskets
• MFM/TG: Sheet gaskets, spiral wound with centering ring

Choosing the correct flange facing type is essential for ensuring leak-free operation and optimal sealing performance in your piping system.

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