SOMAS MTV - Procedure to Evaluate a Leakage on a Butterfly Valve with Pneumatic

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Edition: 2021-04 Original document - Mi-205 EN
6.2.1 Procedure to evaluate a leakage on a butterfly valve with
pneumatic actuator installed in a pipeline
1. Open the butterfly valve entirely, to flush out existing particles on the sealing
areas.
2. Make sure that no impurities was clamped between the seat and the disc.
3. Close the butterfly valve.
1 End position bolt “open” position 2 End position bolt “closed” position 3 Type plate
Fig.6-2 End position bolts on pneumatic actuator
If the leakage remains futhermore, open the valve slightly: