Series 121
MAINTENANCE
600968EA
Edition 2015-11-16
17/27
NOTICE
Inappropriate tools
Sealing surfaces may get damaged.
Do not use sharp-edged tools.
The numbers in brackets ( ) refer to «Figure 6-4» on page 19.
1. Vent chambers on either side to atmospheric pressure.
2. Open valve.
3. Disconnect compressed air supply.
4. Disconnect electrical power supply.
5. Loosen both screws (2).
6. Swing the both screws (2) out (only for DN 160 or higher).
Make sure to maintain upper valve body (5) in its position while losing and
swinging out the screws!
7. Lift upper valve body (5) carefully from lower part of body (1) without touching the body
wall and put it on a clean place (seat side symbol «
∇
» on top).
Do not touch the actuator with the lifting ropes, if you lift the upper valve
body!
8. Apply compressed air (air pressure approx. 1 bar) and move mechanism slowly out of
upper part of body (5).
Provide sufficient free space in order to prevent the mechanism from
touching any objects.
9. Disconnect compressed air.
10. Remove gate seal (1) from groove; see «Figure 6-2»; use O-ring removal tool.
1 Gate seal
2 Valve gate
Figure 6-2
