Series 541
REPAIRS
291187ED
Edition 2015-07-09
19/25
Make sure that the sealing surface is free of scratches.
12. Put new FLEX VATRING (Y1 or Y2) on sealing surface of plate (21/1).
Make sure that the seal ring is installed in the correct direction. The marks on
the ring (see figure 7-2) have to point towards the holding ring and not towards
the bellows.
Initial condition
FLEX VATRING (36/1)
without mark
Service kit 1
FLEX VATRING (Y1)
with 1 mark
Service kit 2
FLEX VATRING (Y2)
with 2 marks
Figure 7-2
13. Put 1 washer (X1) for service kit 1 or 2 washer (X2) for service kit 2 on plate (21/1).
14. Put holding ring (60) on plate (21/1).
15. Put washer (66) on plate (21/1).
16. Insert nut 65 and tighten the nut slightly. The seal ring, holding ring and washer should
only slightly be fixed in their position.
17. Level out FLEX VATRING (Y1 or Y2) and plate (21/1) along the whole circumference.
Height difference shall not exceed 0.1 mm. Check height difference accurately at four
spots (measured angle 90°) around the whole circumference.
Figure 7-3
18. Clean sealing surfaces of bonnet and seat of valve body with pure alcohol
(Isopropanol), use cleanroom wiper.
