Mechanical Face Seals for Extreme Rotation

Mechanical Face Seals for Extreme Rotation

Mechanical Face Seals for Extreme Rotation



Trelleborg Sealing Solutions launches its new range of Mechanical Face Seals. These are specifically engineered for rotating applications in extremely arduous environments where they withstand severe wear and prevent ingress of harsh and abrasive external media. They are available with metal parts in cast iron or bearing steel. The bearing steel option offers significant cost savings on medium to large seals within suitable applications.

The Mechanical Face Seal, also commonly referred to as Face Seal or Heavy Duty Seal, consists of two identical metal sealing rings mounted in two separate housings face-to-face on a lapped seal face. The metal rings are centered within their housings most commonly by O-Rings or otherwise by elastomers with a diamond-shaped cross section. One half of the Mechanical Face Seal remains static in the housing, while the other half rotates with its counter face.

Bearing steel option can offer significant cost savings

The metal part of the Mechanical Face Seal is available in special heat-treated high-alloy corrosion-resistant mold cast iron or a forged roller bearing steel. Selection of material depends on operating conditions. Cast iron will operate in speeds up to 10 ft/s / 3 m/s with oil lubrication, while for rotational speeds up to 2.2 m/s, bearing steel is adequate.

“Up to 7.2 ft/s / 2.2 m/s the bearing steel option, due to lower process and material costs, can offer significant savings, especially for medium to large size Mechanical Face Seals,” says Carlo Calvietti, Technical and Quality Manager of Trelleborg Sealing Solutions, Modena, Italy, where the seals are manufactured. “In addition, there is more flexibility in design, allowing the seals to be custom engineered for specific housings.”

3D of Mechanical face Seal in typical application.

Wide operating temperatures and compatible with virtually all media

The elasticity of the O-Rings or elastomer rings generate a uniform axial face loading for the metal rings as well as acting as static seals on the inner and outer diameter. They also prevent the metal seal ring on the static side of the Metal Face Seal from turning within the housing and transmit the torque from the rotating half of the housing, through the faces, to the static half.

Temperature resistance depends on the type of elastomer used within the seal. A choice of Acrylonitrile Butadiene Rubber (NBR), Hydrogenated Nitrile Butadiene Rubber (HNBR), Fluoroelastomer (FKM) or Silicone (VMQ), provides an operating range between -40°F to +392°F / -40°C to +200°C . These compounds also give chemical compatibility to virtually all media encountered in applications where Mechanical Face Seals are used.

Mechanical Face Seals are suitable for a wide range of applications such as this off-road vehicle.

Suitable for numerous difficult applications

Mechanical Face Seals are ideal for sealing in heavy duty rotating applications such as rollers, front idlers and final drives of tracked vehicles, graders, shovels, ploughs and scrapers on tractors, off-highway trucks, drilling machines, hydraulic excavators, conveyors, concrete mixers, asphalt plants, mining equipment, crushing equipment, mowers, hay balers and wind turbines. They are particularly suited for fitment on axles, gearboxes, mixers and stirrers.

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