DESCRIPTION

The MTM900 series has been designed to attack the market of small boats and it is the direct competitor of the well-known bellows mechanical seals for propeller shaft.
It is an innovative product which, thanks to a few improvements, it guarantees the achievement of high performance. The MTM900 design makes it the most compact propeller shaft seal in the world. The structure of the stationary part, designed for stern tube installations, is usually made of techno-industrial polymers which avoid problems as ageing, puncture, fire to which the rubber is generally subject. It is designed for shafts with diameter 35 mm up to 185 mm in a wide range of configurations including the MTM908, which is fitted inside with a pneumatic barrier system named Watershield®, and the MTM905, which is also equipped with the pneumatic barrier system inside, but it is also characterised by two halves sliding rings. In the latter type, you can use the “Repair Kit” in two halves and carry out maintenance with the boat in water, without decoupling the shaft from the coupling. The interface dimensions are always customized by Microtem on the shipowner’s need.

Operating limits:

D= 35 – 185mm
P1= 2.5 bar
T= -40 a + 150°C
V= 20 m/s.
Axial movement: up to +/- 10.0 mm
Radial movement: up to +/- 5.0 mm
Angular movement: up to 2°

Elastomers:

EPDM
NBR

Face materials:

Silicon carbide
Tungsten carbide
Antimony carbon
Resin carbon
SS316
Duplex

Technical Drawing

Components

1. Stationary holder
2. O-ring
3. Rotary ring
4. Stationary Ring
5. Grub screw
6. O-ring
7. O-ring
8. Grub screw
9. Spring
10. Preload Screw
11. Screw

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