EagleBurgmann (formerly Burgmann) offers one of the industry's most comprehensive portfolios of mechanical seals, with hundreds of product families designed for every conceivable application. This guide provides a practical overview of the most popular, widely used, and industry-standard models across their extensive lineup.

A Note on the Model Universe

Burgmann’s product system is vast, encompassing an estimated 300+ series and thousands of individual part numbers. A complete, exhaustive list is impractical for everyday use. Instead, selecting the correct model follows a clear logic: application first, then specific operating conditions (medium, pressure, temperature, speed), which determines the series.

Popular Models by Application Category

I. General Pump Seals (Water, Process, Light Chemicals)

These are the workhorses found in countless industrial facilities.

• M3N / M7N Series (Standard Cartridge Seals)

  • Profile: The undisputed industry standard, especially the M7N. Features a robust multi-spring, balanced design.

  • Why it’s Popular: Extremely reliable, readily available, and has a proven track record. The M7N is the go-to choice for a vast range of process pumps in chemical, petrochemical, and water treatment.

• MG1 / MG9 Series (Compact Seals)

  • Profile: Ultra-compact, unitized cartridge seals with a very short axial length.

  • Why it’s Popular: Perfect for small centrifugal pumps, submersible pumps, and applications with severe space constraints. Easy to install and maintain.

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II. Seals for Abrasive & Dirty Services (Slurries, Wastewater)

These models are built to handle solids, crystallizing media, and high viscosity.

• HJ92N Series

  • Profile: Features a large, single spring mounted outside the seal chamber (externally mounted).

  • Why it’s Popular: Excellent for pumping media that are viscous, contaminated, or prone to crystallization (e.g., wastewater, paper stock, some slurries). The external spring is protected from clogging.

• HR/HRN Series (Heavy-Duty)

  • Profile: Rugged, multi-spring seals designed for severe abrasive services.

  • Why it’s Popular: The standard choice for demanding applications in mining, minerals processing, and power plant FGD (Flue Gas Desulphurization) systems. Built to withstand the punishing wear from slurries and abrasive particles.

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III. Seals for High-Pressure, High-Speed, and API 682 Compliance

These seals meet stringent requirements for safety, reliability, and performance in critical services.

• H7N / H74-D Series (Balanced High-Performance)

  • Profile: A balanced, pusher-type seal designed for high pressure and high-speed operation. Often configured to meet API 682 requirements.

  • Why it’s Popular: The primary choice for refineries, upstream oil & gas, and high-pressure water injection pumps. Its floating stationary design offers excellent vibration resistance.

• M74-D Series

  • Profile: A versatile, high-performance cartridge seal, also commonly configured for API 682 Arrangements 1, 2, and 3.

  • Why it’s Popular: Offers a reliable, standardized solution for a wide range of hydrocarbon and chemical services, making it a staple in API 610 pumps.

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IV. Metal Bellows Seals

Eliminate the pusher assembly and spring for superior performance in problematic conditions.

• MFL65 / MFL85 Series

  • Profile: Axially mounted metal bellows seals. The MFL65 is a classic design, while the MFL85 is a welded metal bellows for extreme temperatures.

  • Why it’s Popular: Ideal for high-temperature applications, media that crystallize or polymerize, and services where solids could clog a pusher seal. Widely used in hot oil, refinery, and chemical services.

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V. Agitator & Mixer Seals

Specifically engineered to handle the run-out, shaft deflection, and pressure reversals common in stirred vessels.

• MFLWT Series (Bellows)

  • Profile: A heavy-duty metal bellows seal for top-entry mixers and reactors.

  • Why it’s Popular: Excellent for high-temperature applications and media that tend to solidify. Its bellows design handles shaft movement superbly.

• SAF/SAP Series

  • Profile: A cartridge-mounted, spring-loaded tandem seal arrangement.

  • Why it’s Popular: Often the standard for demanding reactor applications, especially where a dual containment safety system is required for hazardous media.

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VI. Compressor & Gas Turbine Seals

A specialized product line for high-speed rotating equipment.

• Espey WD Series (Dry Gas Seals / Gas Lubricated)

  • Profile: Advanced, non-contacting gas lubricated face seals for centrifugal compressors and turbines.

  • Why it’s Popular: Drastically reduces friction and power loss compared to traditional oil seals, offering superior reliability and efficiency in gas compression. A key technology for modern turbomachinery.

Conclusion: Finding the Exact Model

Remember, a designation like "M7N" is a series. The complete part number (e.g., M7N-50-Z-S) specifies the exact size, materials (like Silicon Carbide vs. Tungsten Carbide), and secondary sealing elements.