Rubber Bellow Expansion Joints with DIN Flange for Marine Piping Systems

These rubber bellow expansion joints with DIN flanges are specifically engineered for marine pipe and tube fitting applications. They effectively absorb thermal expansion, reduce mechanical vibration, and compensate for minor pipe misalignment in shipboard systems. Constructed with multi-layer synthetic rubber and reinforced fabric, these joints are built to withstand the harsh conditions of seawater, oils, and fluctuating temperatures commonly encountered in marine environments.

Designed to integrate seamlessly with DIN PN10/PN16 flanged connections, these expansion joints provide a reliable and maintenance-free solution for seawater cooling circuits, exhaust lines, ballast piping, and various other shipboard systems. Their flexibility helps protect pumps, valves, and other sensitive equipment from stress caused by movement or induced vibration.

Key Features

Technical Specifications

SpecificationValue
Nominal Diameter (DN)DN 32 – DN 600
Flange StandardDIN PN10 / PN16
Working PressureUp to 16 bar (depending on size and fluid)
Temperature Range-20°C to +110°C (standard grade)
Bellow MaterialEPDM / Neoprene (synthetic rubber)
ReinforcementMulti-ply polyamide or aramid fabric
Flange MaterialCarbon steel (galvanized or primer-coated) or stainless steel
ApplicationsMarine seawater cooling, exhaust, bilge, and general pipe systems

Frequently Asked Questions

What fluids are these rubber bellow expansion joints suitable for?

These joints are suitable for seawater, fresh water, air, and dilute chemical solutions. They are not recommended for strong acids, petroleum-based fuels, or solvents unless explicitly stated for the selected elastomer grade.

Can these joints correct pipe misalignment?

Yes, rubber bellows are designed to compensate for moderate axial, lateral, and angular misalignment. However, excessive misalignment should be avoided to extend service life.

What is the maximum working pressure for these DIN flange expansion joints?

The working pressure depends on the nominal diameter and temperature. For standard DN50 parts, the maximum working pressure is 16 bar at 20°C. At higher temperatures, derating may apply.

Are these expansion joints suitable for exhaust systems?

Yes, with a high-temperature elastomer grade (such as Viton or PTFE-lined), they can handle elevated temperatures typical of marine exhaust systems. Standard EPDM is limited to 110°C.

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