MAINTENANCE
Series 121
18/27
Edition 2015-11-16
600968EA
11. Check and clean sealing surface of valve seat; use cleanroom wiper.
12. Install new gate seal (1); see «Figure 6-2».
Press O-ring uniformly in crosswise order (diagonal) into groove.
13. Remove bonnet seal (3) from groove; use O-ring removal tool.
14. Check and clean sealing surface of bonnet seat; use cleanroom wiper.
15. Install new bonnet seal (5).
•
Press O-ring into groove on one short side.
•
Distribute seal uniformly over long sides to opposite short side and press it
fully into groove.
Make sure to have gate (2); see «Figure 6-2»; on seat side «
∇
»;
see «Figure 6-4» on page 19.
Align mechanism with opening of upper part of body.
16. Apply compressed air (air pressure approx. 1 bar) and move mechanism slowly into
upper valve body (5).
Provide sufficient free space in order to prevent the mechanism from
touching any objects.
17. Disconnect compressed air from valve.
18. Lift upper valve body (5) carefully back into the lower valve body (1) without touching
the body wall.
The tips of the triangles «
∇
» of both body parts must face each other;
see «Figure 6-3 » on page 19 and «Figure 6-4» on page 19.
