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Original document - Mi-205 EN Edition: 2021-04
If the leakage remains futhermore, open the valve slightly:
Loosen the end position bolts “closed” (
➔ Fig.6-3/2) of the worm gear actuator and
turn this a fourth-turn anticlockwise. Test the valve. Repeat the procedure until the
valve is tight. If the end position bolt was loosend more than three turns, and the
butterfly valve remains leaking, the seat is damaged and has to be replaced.
Tighten the lock nut of the end position bolt, if the butterfly valve is tight.
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