How it works
Outboard water will be pumped through water lubricated journal bearings towards the propeller. In outboard water, abrasive particles are present and it is advisable to filter the water before it is pumped through the stern tube. The shaft bearings are allowed to have more wear, thus gaining more radial clearance when compared to oil-lubricated white metal bearings.
By means of a shaft following subassembly, using a composite bearing and a NBR bellow, the seal can take up a large radial shaft displacement and no manual adjustments for alignment are necessary. This makes it an ideal seal for open water lubricated stern tube systems.
Through the proven technology and state of the art design of the Supreme® radial lip seals, large axial shaft displacement is allowed, making sure the seal also functions well in heavy conditions.
The materials of the wear parts of the seal have been optimised to be more wear resistant. High wear resistant NBR lip seals run on a corrosion-resistant liner with a hardened surface, to enlarge the seal’s average time between maintenance. The seal is modified with a stainless steel fresh water tank to provide lubrication for the lip seal #2. Status monitoring of your lip seals is provided via level switches on this tank, giving you an early warning before any real damage is done.
The Floating Water Lubricated seal is equipped with an inflatable safety seal, which can be activated in case in situ maintenance is due while afloat.
The Floating Water Lubricated forward seal is robustly executed giving you Peace of Mind so you can keep going.
Interested in more information?
Contact Jan Willem Bongers to see how we can help you!