5 Maintenance
Study the instructions carefully.
The items refer to the parts list and service kits section. Lubricate the rubber seals before fitting them.
A larger actuator is available for valve sizes DN/OD38-63.5 mm. The spring assembly can be replaced by a stronger one.
A/A = Air/air activated.
5.5
Assembly of actuator
Step 1
1. Remove piston (6) and spring assembly (10)
2. Remove O-ring (5) from the piston. (also remove guide ring (22)
and top pin (23))
NOTE!
The A/A actuator has no spring assembly.
TD425-229_1
Step 2
1. Fit O-rings (2, 7) in bonnet (8) and cylinder (3). (also fit O-ring
(24) and guide rings (21, 25))
2. Fit the cylinder
TD425-177_1
Step 3
1. Fit lock wire (4) through the slot in cylinder (3) into the hole in
bonnet (8)
2. Rotate the cylinder 360o (see step 4)
Rotate by hand or
with the service tool!
TD425-177_1
Step 4
NOTE!
It is recommended to rotate cylinder (3) further 180
o
in relation to
bonnet (8) so that the top and bottom air connections are fixed
on the same side.
Top air connection
Bottom air
connection
25
