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Series 190
1.
Vent chambers on either side to atmospheric pressure.
2.
Open the valve.
3.
Disconnect electrical power supply.
4.
Remove the screws (3) from the body upper part (7) in crosswise order;
see «Figure 6-1» on page 16.
5.
Lift actuator / mechanism unit carefully from body without touching the body wall and
sealing surfaces.
6.
Move the mechanism unit with the body upper part to a clean, safe table for
maintenance.
7.
Disconnect compressed air supply.
8.
If the mechanism unit is out of the valve body you have the opportunity to clean the
mechanism unit with alcohol.
9.
If the O-rings at the gate and the bonnet flange are not damaged you should clean
them with cleanroom wiper.
10. If the O-rings at the gate unit and the bonnet flange are damaged, they have to be
changed.
11. Take out the gate O-ring with the O-ring removal tool.
12. Put some slight vacuum grease on the new gate O-ring.
13. Put in the new gate O-ring into the gate groove.
14. Take out the bonnet O-ring.
15. Put some slight vacuum grease on the new bonnet O-ring.
16. Put in the new bonnet O-ring into the bonnet flange groove.
17. Connect compressed air supply and put air on bring the mechanism into open position.
18. Lift the actuator / mechanism unit back into the valve body and do not touch any
sealing surfaces.
19. Tighten the screws (3) from the body upper part (7) in crosswise order with the correct
tightening torque.
600242EA
MAINTENANCE
Do not touch the actuator with the lifting ropes, if you lift the actuator +
mechanism out of the valve body!
Do not clean the O-ring with alcohol, because alcohol may damage the
surface of the O-rings, we recommend to treat the O-rings with a small
amount of vacuum grease.
Edition 2013-08-12
17/25
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