WALKERSELE Ultraglide from James Walker is set to be the new high-efficiency rotary lip seal that will benchmark the low-maintenance demands of hardworking industrial plant.
Extensive trials on hot steel mill bearings in Germany have exceeded expectations. Other seals on this mill failed after a few weeks due to high under-lip temperatures and water contamination of the grease.
Walkersele Ultraglide seals have run seven months without noticeable loss of performance or integrity.
Ultraglide's success is based on a new hydrogenated nitrile (HNBR) elastomer, developed by James Walker Technology Centre for lip seals that run for long periods under hot, abrasive conditions.
Bearing life and bearing seal technology are often the limiting factors when plant operators want higher shaft speeds and working temperatures plus extended maintenance-free operation.
Rotary seals based on conventional nitrile (NBR) rubber suffer lip hardening and cracking at high running speeds when under-lip temperatures reach around 100°C.
Although fluoroelastomer (FKM) compounds can survive 200°C, they have poor wear resistance and limited physical strength at high temperatures. They are also more expensive to produce and mould.
James Walker's new HNBR material has been formulated to overcome all these problems. It withstands under-lip temperatures in excess of 150°C. Extended life and improved high speed running are achieved by the material's low coefficient of friction (0.25) and superior heat dissipation properties.
Walkerseles Ultraglide was developed with rolling mills and other heavy transmission systems in mind and it also presents great potential on rotary process plant in abrasive environments. James Walker Australia 02 9644 9755.