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Products Mechanical Seals > Component Mechanical Seals > Bellows Mechanical Seals

Metal Bellows Component Mechanical Seals

Bellows Component Mechanical Seals are a type of mechanical seal used in various industrial applications to prevent fluid leakage. They are distinguished by their bellows, which are flexible, accordion-like components that provide several advantages over traditional mechanical seals.

Chem Pro Bellows
Chem Pro

The Chem-Pro mechanical seal is designed to work with extremely aggressive chemical compounds which do not contain abrasive particles.

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TBH Bellows

Metal bellows design and flexible Graphite secondary seal for high temperatures.


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TBS Bellows

Metal bellows design and static O-ring seal eliminates shaft fretting.


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Structure and Function of Bellow Seals


  1. Bellows: The primary feature, usually made of metal (like stainless steel, Hastelloy, or Inconel) or elastomer, providing flexibility and compensating for axial, radial, and angular movements.
  2. Sealing Faces: Typically made of hard materials like silicon carbide, tungsten carbide, or carbon, these faces create the primary sealing interface.
  3. Secondary Seals: O-rings, gaskets, or PTFE seals that provide additional sealing capabilities.
  4. Spring Mechanism: Often integrated within the bellows, providing the necessary force to maintain contact between the sealing faces.

Working Principle

Bellows component mechanical seals work by maintaining a precise, controlled pressure between the sealing faces. The bellows allow for flexibility, accommodating misalignments, thermal expansion, and other dynamic movements while maintaining a tight seal.


  1. Flexibility and Versatility: The bellows design allows for greater flexibility, accommodating shaft misalignment, thermal expansion, and vibrations.
  2. Corrosion Resistance: Depending on the material used for the bellows, these seals can offer excellent resistance to corrosive environments, making them suitable for aggressive fluids.
  3. Reduced Wear and Tear: The uniform pressure distribution provided by the bellows reduces wear on the sealing faces, extending the seal’s operational life.
  4. Compact Design: Bellows seals are often more compact compared to traditional pusher seals, making them ideal for applications with space constraints.
  5. Leakage Prevention: The design minimizes the potential for leakage, even in challenging operating conditions.


Bellows component mechanical seals are used in a variety of industries and applications due to their versatility and reliability:

Chemical and Petrochemical Industries

  • Pumps and Compressors: Handling aggressive chemicals, acids, and alkalis.
  • Reactors and Agitators: Ensuring leak-proof operations in chemical processing.

Oil and Gas Industry

  • Drilling Equipment: Providing reliable sealing in harsh and abrasive environments.
  • Pipeline Pumps: Ensuring safe and leak-free transportation of hydrocarbons.

Pharmaceutical Industry

  • Sterile Pumps: Ensuring contamination-free processing of pharmaceuticals.
  • Mixers and Blenders: Maintaining integrity and preventing leaks in sensitive applications.

Water and Wastewater Treatment

  • Pumps: Used in clean and dirty water applications, providing robust sealing solutions.
  • Aerators and Mixers: Ensuring efficient operation without leaks.

Power Generation

  • Boiler Feed Pumps: Handling high-pressure and high-temperature conditions.
  • Circulating Pumps: Ensuring continuous and reliable operation in power plants.

Food and Beverage Industry

  • Dairy Processing Equipment: Maintaining hygiene and preventing contamination.
  • Beverage Pumps: Ensuring leak-free transfer of liquids.

Pulp and Paper Industry

  • Pulp Agitators: Handling abrasive pulp suspensions.
  • Paper Machine Pumps: Providing reliable sealing in various stages of paper production.

Special Considerations

  1. Material Selection: Choosing the right material for the bellows and sealing faces is crucial for compatibility with the fluid being handled.
  2. Installation and Maintenance: Proper installation is vital for optimal performance. Regular maintenance can further extend the seal’s life.
  3. Operating Conditions: Understanding the specific operating conditions, including temperature, pressure, and fluid properties, is essential for selecting the right bellows component mechanical seal.

In summary, bellows component mechanical seals are a versatile and reliable sealing solution, suitable for a wide range of demanding industrial applications. Their unique design and materials offer significant advantages in terms of flexibility, durability, and resistance to harsh environments.