SOMAS MTV - Disassembly; Cleaning, Lubrication and Assembly

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Original document - Mi-205 EN Edition: 2021-04
6.4.1 Disassembly
Note
i
The replacement of the seat should be made with installed actuator.
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.6-5/17) and remove the cover plate (➔ Fig.6-5/10).
2. Lift the seat (
➔ Fig.6-5/14) out of the butterfly valve.
6.4.2 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.6-5/17) with molybdenum disulphide paste.
3. Insert in the new seat (
➔ Fig.6-5/14).
4. Refit the cover plate (
➔ Fig.6-5/10).
5. Tighten screws (
➔ Fig.6-5/17) in rotating order.
6. Check the “closed” position of the butterfly valve and adjust if necessary by
setting the end position bolt on the actuator (
➔ Chap. 6.6).