Exhaust Bellows

Standard Bellows

The first and most common combination of features is what we like to call “Standard Bellows.” TRU-FLEX's standard bellows offer excellent thermal expansion and vibration/motion control while meeting industry required leak specifications. They also deliver extremely long fatigue life if no torsional motion is present.

Features

• Corrugated stainless steel body
• Internal polylock liner (optional)
• External braid (optional)
• External mesh (optional)
• Vibration damping mesh (optional)

Severe Duty Bellows

TRU-FLEX’s Severe Duty Bellows is the second sub-grouping of products and they are aimed at offering excellent durability in difficult applications. In addition this design combination reduces static loss and has superior thermal insulating properties when compared to standard bellows. The robust design withstands severe displacements and includes a braided exterior that protects the bellows from external damage.

Features

• Corrugated stainless steel body
• Internal polylock liner
• External braid
• Vibration damping mesh (optional)

Torsional Bellows

The third family to discuss is the Torsional Bellows. It is basically the Standard Bellows listed above with the addition of TRU-FLEX’s patented torsional joint. The Torsional Bellows line of flexible metal exhaust hoses is the ideal solution for a decoupler that will accommodate a full range of motion, including torsion or twisting motion. The torsional joint is, for all intents and purposes, a sealed slip joint and allows for the ends to rotate relative to each other. Some customers use this feature to ease assembly of the exhaust system.

Unlined

TRU-FLEX's Unlined Torsional Bellows offers extremely long fatigue life and is compliant with North American and European Emissions Standards.

Features

• Patented B/T Joint
• Bellows Body
• Variety of ends

Lined

Lined Torsional Bellows offers enhanced durability and the added benefit of noise reduction. This product has excellent thermal insulation properties, potentially eliminating the need for extra insulation. It also reduces static loss.

Features

• Patented B/T Joint
• Bellows Body
• Polylock Liner
• Mesh Ring (optional)

Premium Lined (Interlock and Mesh Damping Material)

Insulated Torsional Bellows delivers enhanced durability and the added benefit of vibration damping within the exhaust system. This is an ideal de-coupler to be used in situations where high frequency vibrations exist.

Features

• Patented B/T Joint
• Bellows Body
• Polylock Liner
• Mesh Ring (optional)
• Ends (optional)

More Information Check it out Torsional Bellows in Action

Insulated Bellows

Insulated Bellows add insulation to the mix. Insulated bellows assemblies are intended to keep precious heat inside the exhaust stream. A number of low- and high-tech materials and application methods (blankets, socks, metal encapsulation, …) are available to be engineered into your solution.

Features

• Corrugated stainless steel body
• Internal polylock liner
• Vibration damping mesh (optional)
• Straight and/or bent flange end fittings
• Full coverage insulation
• Silicone bellows exterior

Low Skin Temp Bellows

The Low Skin Temp Bellows are similar to the insulated bellows listed just above but they include an extra bellows made from reinforced silicone to keep the external temperature of the bellows down. Depending on application this can serve the purpose of human skin contact safety or the lowering of risk igniting materials (such as wheat chaff or cotton) which may otherwise come into contact with the hot surface of the metal bellows inside. Of course the layers of insulation also provide heat retention within the exhaust stream.

Features

• Corrugated stainless steel body
• Internal polylock liner
• Vibration damping mesh (optional)
• Straight and/or bent flange end fittings
• Full coverage insulation
• Silicone bellows exterior

Insulated Rigid Tubes

Insulated Rigid Tubes are a special product where the bellows are found inside a rigid tube and DO NOT provide vibration isolation such as traditional bellows but do afford the enablement of internal insulation or air gap within complex rigid tube assemblies.

Complex Assemblies

It is what it sounds like. Our most complex flexible assemblies can be made from many or all of the products features listed in one or multiple bellows in an assembly which includes multiple straight and bent sections of pipe and other features for mating to other exhaust components or attaching the assembly to a chassis.

Product Summary

The following table summarize the features available as standard or optional in the above products. With few exceptions all of these features can be combined in a myriad of ways. We suggest you engage with your Sales Engineer to discuss what is the best solution fitting your needs.

Features and Benefits of Bellows

There are 8 feature categories which can be combined in many many ways to achieve the benefits our customers need to solve their challenges. The following table illustrates a summary of the key features (columns) and benefits (rows).

Sales and Application Engineering

TRU-FLEX attracts customers from around the world. The reason? The superior sales and application engineering support and willingness to provide customer-specific solutions.

Design and Validation Testing

TRU-FLEX maintains extensive engineering and technical resources that are available to address the unique design verification and testing requirements of our customers. To support these efforts, we have created a proprietary design verification software to validate the calculated life of our parts over the life cycle of your product or application. This, coupled with our testing services, helps to ensure optimum performance post commercialization. These services can also be utilized to troubleshoot issues in existing applications.

Prototypes and Samples

Want a Sample of one of our products similar to what you are thinking about?

Product Research and Development

TRU-FLEX holds many patents and utilizes many proprietary methods for design and production of leading edge flexible exhaust products. We are not going to announce to the world on our web site what is going on in our skunk works. Instead we want to use this space to encourage you to bring your challenges to us and let our R&D team lead the way to the next generation of flexible exhaust solutions.

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Opportunity Starts Here

Opportunities don’t just happen. They are made. Let us know what you’re thinking, what you need, and where you’d like to go. We are there!

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