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.
The seals RMTA and RMTO are of reduced dimensions, easily assembled and come complete with stainless steel clamps and to a dispenser of sea water-resistant silicone based grease, which reduces friction and keeps down the temperature produced by the propeller shaft rotation. Additionally there is a special protection to help the shaft fitting.
Project important points:
- entrance point for the lubrificant grease, including a special closing cap, in order to help the insert on the seal.
- separate attachment for the water entrance in order to grant the necessary hydrolubrification of the shaft and the possibility to mount the seal above or under floating water.
- both type of seals are suitable for speed up to 30 knots.