REPAIRS
Series 541
18/25
Edition 2015-07-09
291187ED
Required material:
Service kit 1 or 2
Ordering information: See chapter «11 Spare parts» on page 25
and «Figure 7-1» on page 17
NOTICE
Inappropriate mounting position of valve
Maintenance may be troublesome and parts may drop down.
Ideally dismount valve from the system and put it on a clean workbench with
the actuator upwards.
Procedure:
The item numbers in brackets refer to «Figure 7-1» on page 17.
1. Close valve.
Make sure that the valve is closed to mechanical stop! This is required to
protect the bellows from twisting and the seal ring from sliding.
2. Loosen the nut (65) but don’t remove.
3. Open valve.
Make sure that valve is opened to mechanical stop!
4. Remove bonnet screws (68).
5. Pull valve insert carefully out of the valve body without touching the body wall.
Touching the body wall may cause severe damage to delicate parts of the insert.
6. Remove flat seal (36/2).
If you intend to use the flat seal again, please note/mark the bonnet side of the
seal. This to be able to use the seal in the same orientation again.
7. Remove the nut (65).
8. Remove washer (66).
9. Remove holding ring (60).
10. Remove FLEX VATRING (36/1).
11. Clean sealing surface of plate (21/1) with pure alcohol (Isopropanol), use a cleanroom
wiper.
