Factory Supply Tunnel Boring Machines Seals Different Types Of Seals

Every tunneling project begins with the silent strength of engineering beneath the ground. While the spotlight often falls on the massive cutterheads of shield machines, few stop to consider what keeps the operation stable and leak-free—sealing systems.

DEDE provides general parts and also produces seals that meet the specific needs of underground construction. This includes abrasion management, temperature endurance, and fluid resistance, all packed into precision-engineered sealing profiles. Whether facing groundwater intrusion or high rotation speeds, these seals are developed to perform under sustained mechanical and environmental stress.

Manufacturer Direct Supply—What It Means for You
One notable aspect of DEDE's business model is its direct supply approach. This eliminates intermediate channels and allows clients to receive sealing components straight from the production floor. The result? More predictable lead times, easier technical communication, and reliable product traceability.

This model supports large infrastructure contractors and machine repair teams alike, especially when working with TBMs that demand frequent seal replacements or unique dimensions.

Durable Performance for Shield Machines
The sealing rings produced by DEDE are specifically crafted for use in shield tunneling systems, including earth pressure balance (EPB) machines and slurry TBMs. These machines operate under substantial axial and radial pressure, often encountering abrasive soil and fluid-laden environments.

To meet these conditions, DEDE applies rubber compounds such as FKM and HNBR, combined with fabric reinforcement or metal frameworks, depending on the function. Lip-type configurations and grooved geometries are designed to prevent internal leakage while withstanding shaft misalignment or unexpected pressure spikes.

These seals are not standardized across machines. Instead, DEDE offers customization based on shaft diameter, housing structure, rotation speed, and lubricant exposure, ensuring a functional fit rather than a forced compromise.

Beyond Just a Seal—An Integrated Component
Within a tunnel boring system, a sealing ring does more than stop leaks. It isolates internal systems, protects high-precision bearings, and helps maintain pressure balance within the machine. DEDE’s seals are tested to retain functionality even after long intervals between inspections, reducing the risk of emergency shutdowns during active tunneling.

In addition, some designs incorporate dust lip structures and multi-material composite layers to further extend lifespan, especially when working in sediment-heavy strata.