PRODUCT DESCRIPTION

It is surely the more resistant propeller shaft seal on the market. The MTM400, in comparison with all the existing propeller shaft mechanical seals, is the first in the world to be equipped with a double series of springs. This allows it to better compensate for angular and radial misalignments. Moreover, springs together with a double system of O-rings give rise to what Microtem has named DEDaS® (Double Elastic Damping System), that is an elastic damping system able to make the MTM400 resistant to 60 g shock and to 60 mm/s (RMS) of vibration. Inside of it, in the rotating part, there is another international recognized innovation: the pumping ring. This technology, newly introduced in the propeller shaft seals, ensures that the cooling fluid (usually water) is distributed to a greater and better extent on the sliding faces, increasing the heat dissipation and thus reducing consumption. All this allows MTM400 to achieve performance over 60.000 hours of operation before maintenance. Of equal importance is the design, as its compact size allows the seal to be one of the axially smaller solutions in the world. Additionally, the MTM400 together with the dynamic pneumatic barrier (Watershield®) is the most reliable and strong solution available today on the market. It is designed for shafts with diameter 50 mm to 800 mm, and it is certified by RINA. There are different possible material configurations and it is the only product fireproof. The stationary flange can be designed with a maximum of 6 radial holes that allow to connect: one or more auxiliary cooling lines for the bearing, a pressure gauge, a temperature gauge, a flow gauge or an axial/radial vibration sensor. Suitable for all applications, it is the best product for mega Yachts, passenger and military vessels.

Operating limits:

D= 50 – 800mm
P1= 2 bar
T= - 40 a + 400°C
V= 20 m/s.
Axial movement: up to +30.0/- 18.0 mm
Radial movement: up to +/- 20.0 mm
Angular movement: up to 2°

Elastomers materials:

Epdm (E)
Nbr (N)

Metal parts materials:

Bronze (B1)
Aluminum (AL)
Stainless steel 316 (J1)
Duplex (D)
Super Duplex (D1)

Faces material:

Resin carbon graphite (G)
Antimony carbon graphite (G1)
Resin carbon graphite insert (G2)
Antimony carbon graphite insert (G3)
Silicon Carbide (S)
Silicon Carbide insert(S1)
Tungsten Carbide (T)
Tungsten Carbide insert (T1)

The only Fire resistant one

Technical Drawing

Preload screw

Springs

Components

1. STATIONARY FLANGE
2. ROTARY CASE
3. CENTERING SLEEVE
4. STATIONARY SEAL FACE
5. ROTARY SEAL FACE
6. DRIVE RING
7. O-RING
8. O-RING
9. O-RING
10. O-RING
11. O-RING
12. O-RING
13. PIN

14. GRUB SCREW
15. PRELOAD SCREW
16. WATER INLET
17. DYNAMIC INFLATABLE RING
18. COMPRESSION RING
19. CENTERING RING
20. AIR INLET
21. O-RING
22. SET SCREW
23. SPRING
24. SPRING
25. PRELOAD SCREW

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