SOMAS MTV - Disassembly; Cleaning, Lubrication and Assembly

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Original document - Mi-205 EN Edition: 2021-04
6.6.1 Disassembly
Note
i
The replacement of the seat should be made with installed manual gear unit.
Attention!
The seat disassembly is made by closing spring loaded and double acting actuators with closed
valve, by opening spring loaded actuators with open valve.
Procedure
1. Loosen the screws (
➔ Fig.6-7/9) and remove the cover plate (➔ Fig.6-7/10).
2. Lift the Fire safe seat (
➔ Fig.6-7/32) out of the butterfly valve.
3. Lift the PTFE-seat (
➔ Fig.6-7/14) and the support ring (➔ Fig.6-7/11) and guide ring
(
➔ Fig.6-7/33) out of the butterfly valve.
6.6.2 Cleaning, lubrication and assembly
1. Clean the seat area and cover plate and make sure that the disc periphery is undamaged. Any
damage can quickly destroy a new seat. Small scratches on the disc edge can be removed by
lightly polishing the edge with fine emery cloth.
2. Lubricate the screws (
➔ Fig.6-7/9) with molybdenum disulphide paste.
3. Insert in the new PTFE-seat (
➔ Fig.6-7/14) with the support ring (➔ Fig.6-7/11). Insert the guide
ring (
➔ Fig.6-7/33). Insert the Fire safe seat (➔ Fig.6-7/32).
4. Refit the cover plate (
➔ Fig.6-7/10).
5. Tighten screws (
➔ Fig.6-7/9) in rotating order.
6. Check the “closed” position of the butterfly valve and adjust if necessary by setting the end
position bolt on the manual gear unit (
➔ Chap. 6.8).