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Edition: 2021-04 Original document - Mi-205 EN
6.9 Leak test of the valve
Each valve should be tested for leakage after maintenance work on the seat.
Danger!
Risk of injury!
Observe movements of the disc.
Keep hands, tools and other objects away from the area where the disc moves when the
actuator is connected to compressed air system. Single action actuators may move to “open” or
“closed” position without being connected to the air system.
The valve has to be installed between the flanges for the test procedure with a
prescribed torque (
➔ Tab.6-1).
1. The butterfly valve can be tested with a testing device as in (
➔ Fig.6-10)
shown.
Please consult pressure testing instruction Mi-901 EN.
1 Piece of pipe 3 Flange gaskets 5 Butterfly valve
2 Counter flange 4 Blind flange 6 Water connection
Fig.6-10 Leak test device (schematic diagram for wafer valve types)
In case of leakage the valve must be adjusted again (➔ Chap. 6.9).
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