23
Keeping the World Flowing
Maintenance
11.1.2.5 Reassemble actuator
a) Coat bearings and internal vane seal areas of the case
halves with grease supplied with the seal kits.
b) Clean case flanges with isopropyl alcohol. Insure that all
grease is removed from the flanges.
c) Lightly and evenly coat joint face of one case half with
silicone sealant using GT-3100 One Part RTV Silicone or
Dow Corning Silicone # 732.
Excess sealant, if extruded inside case, will
damage seals.
d) Remove all excess sealant especially from inside edge.
e) Insert vane into one case half, turning it to ease square on
vane shaft through shaft seal. Watch that the vane slides
smoothly through the shaft seals. Lightly rotating the vane
assembly may be necessary.
f) Fit remaining case half on top of the other turning it to
ease vane shaft square through shaft seal.
Check that vane lip seals are not trapped at case joint
flange face when seals are fitted.
g) Tighten case screws to the following torques:
Table 4: Recommended Tightening Torque
Model No.
Torque
Imperial (lbf.in)
Metric (Nm)
KT-03
18
2
KT-06
35
4
KT-10
98
11
KT-20
180
20
KT-30
180
20
KT-40
250
28
KT-50
792
89
KT-60
1540
174
KT-70
1540
174
h) Following assembly, rotate vane manually to check
movement and wipe away sealant extruded internally.
i) Allow setting time for sealant before applying test air
pressure. See instructions on sealant for cure times
recommended.
11.1.2.6 Mechanical travel stop removal
With the actuator placed in a stable position, e.g. on a
workbench.
See Figure 9 and proceed as follows:
• Loosen the lock nut
(2)
.
• Completely loose the stop bolt
(1)
.
• Remove and retain the stop bolt
(1)
and the lock nut
(2)
. If
necessary replace them.
• Remove and replace the washer
(3)
and the under o-ring
seal. Clean the o-ring seat.
1
2
3
Figure 9: Stop bolt sealing replacement.
After the final reassembly on the valve, execute the stop bolt
setting as in Paragraph 9.2.
