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Seals have been developed to operate on propeller shafts of small, medium and large size boats where a high level of reliability is required.
The special design allows large axial displacement and the use of suitable material guarantees as well as high resistance to corrosion and high mechanical resistance to withstand stresses produced by vibrations.
The installation of mechanical seals in this particular field has solved problems such as corrosion during long periods of inactivity and shaft damage caused by traditional stuffing boxes. Power absorption is considerably reduced as well.
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The use of face seals allows us to resolve the typical problems in which, over time, the installation of the traditional stuffing box incurs, that is wear on the shaft, wet bilge and continuous tightening of the packing, etc. Schematically, the face seal is made up of two parts: one that is stationary and one that rotates. The stationary part is generally fixed to the packing box; the rotating part is fixed to the shaft and turns with it. Thus there is no wear on the shaft: in fact the true seal is found perpendicular to the shaft in two micro lapped surfaces that rub against one another. The elastic bellows or springs recuperate eventual surface wear, thus the constant tightening of the packing is not required. Moreover, the presence of bellows and/or springs, in addition to recuperating wear, serves to compensate eventual misalignment, absorbing vibrations or sudden shifts of the shaft.
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The Simplan seal is a mechanical seal for water-lubricated sterntubes for river vessels and seagoing vessels.
Simplan seals meet the highest standards set by the "Central Commission for Rhine Shipping" (European Waterways).
They are certified by Germanischer Lloyd, the American Bureau of Shipping, by Lloyds Register and by ClassNK (Nippon Kaiji Kyokai).
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