Trelleborg launches mechanical face seals
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Trelleborg Sealing Solutions UK product story
Edited by the Engineeringtalk editorial team
Jun 23, 2009
Trelleborg Sealing Solutions has introduced its mechanical face seals for rotating applications in demanding environments to withstand severe wear and prevent ingress of abrasive external media.
They are available with metal parts in cast iron or bearing steel with the bearing steel option offering 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 centred within their housings most commonly by O-rings or otherwise by elastomers with a diamond-shaped cross-section.
Half of the mechanical face seal remains static in the housing, while the other half rotates with its counter face.
'The bearing steel option, due to lower process and material costs, can offer significant savings, especially for medium to large mechanical face seals,' says Colin Macqueen, director, technology, Trelleborg Sealing Solutions Americas.
'In addition, there is more flexibility in design, allowing the seals to be custom-engineered for specific housings,' he added.
The metal part of the mechanical face seal is available in special heat-treated high-alloy corrosion-resistant mould cast iron or a forged roller bearing steel.
Selection of material depends on operating conditions.
Cast iron will operate in speeds up to 10ft/s (3m/s) with oil lubrication, while for rotational speeds up to 7.2ft/s (2.2m/s), bearing steel is adequate.
The elasticity of the O-rings or elastomer rings generates a uniform axial face loading for the metal rings, and these O-rings act 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, provides an operating range between -40F to +392F/-40C to +200C.
These compounds also give chemical compatibility to virtually all media encountered in applications where mechanical face seals are used.
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 fitting on axles, gearboxes, mixers and stirrers.
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