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Actuator Assembly Maintenance
1. Make a mark on the upper actuator casing
(key 11), lower actuator casing (key 5),
intermediate flange (key 25), and body (key 1) to
indicate proper alignment.
2. Remove travel indicator assembly, if present,
by loosening the travel indicator fitting (key 56)
and lifting out the indicator assembly. Refer
to Travel Indicator Maintenance section for
maintenance procedure.
3. Remove cap screws (key 21), washers (key 22),
and hex nuts (key 23). Remove all the short
cap screws first, then evenly remove the two
long cap screws (key 39) and brackets (key 35).
Take care to balance the upper actuator casing
while removing the spring tension. Carefully lift
the upper actuator casing (key 11) off the lower
actuator casing (key 5). Remove spring (key 13).
4. Remove the hex socket cap screws (key 16).
Lift off the diaphragm (key 20) and the inlet plate
(key 18). Remove O-rings (keys 15 and 17).
Inspect the diaphragm and O-rings for damage
or wear, and replace if necessary.
5. Inspect the upper actuator casing (key 11),
O-ring (key 9), anti-friction split rings (key 8), and
anti-friction ring (key 4) for damage or wear. If
damaged, remove the O-ring and split rings; and
replace with new parts. Lightly lubricate the O-ring
and split rings. Place the split rings in the body
first, then slide the O-ring between the split rings.
6. Remove hex nuts (key 26) from the stud bolts
(key 24). Lift off the lower actuator casing (key 5).
Remove the hex socket cap screws (key 33) and
spring lock washers (key 32). Lift off the disk holder
assembly (key 30) and disk retainer (key 31).
7. Slide the sleeve (key 14) out of the lower actuator
casing (key 5) and slide the outlet plate (key 19)
off of the sleeve. Check the sleeve for scratches,
burrs, or other damage, and replace if necessary.
8. Inspect the lower actuator casing (key 5), O-ring
(key 9), anti-friction split rings (key 8), and
anti-friction ring (key 4) for damage or wear. If
damaged, remove the O-ring and split rings; and
replace with new parts. Lightly lubricate the O-ring
and split rings. Place the split rings in the body
first, then slide the O-ring between the split rings.
9. Slide the outlet plate (key 19) onto the sleeve
(key 14) and slide the sleeve into the lower actuator
casing (key 5). Place the disk holder (key 30)
and disk retainer (key 31) on the sleeve adaptor
(key 27). Insert the spring lock washers (key 32)
and hex socket cap screws (key 33) and tighten.
See Torque Specification table for proper torque. If
seat was removed, make sure to reinstall.
10. Lightly lubricate the O-rings (keys 15 and 17) and
the inner and outer diaphragm (key 20) edges.
Make sure O-rings (keys 15 and 17) are correctly
positioned. Place the inlet plate (key 18) and the
diaphragm (key 20) on the sleeve (key 14). Insert
and tighten the hex socket cap screws (key 16).
See Torque Specification table for proper torque.
11. Lubricate surface between lower casing and
intermediate flange. Carefully lift the lower actuator
casing assembly (key 5) and place on the body
(key 1). Take care to match up the alignment marks.
Secure with stud bolts and nuts (keys 24 and 26).
See Torque Specification table for proper torque.
12. Lightly lubricate the spring (key 13) and place on
the inlet plate (key 18).
13. Carefully place the upper actuator casing (key 11)
on the lower actuator casing (key 5). Take care to
match up the alignment marks. Insert the two long
cap screws (key 39) and brackets (key 35) 180°
apart and away from flanges. Place the washers
(key 22) and hex nuts (key 23) on the long cap
screws and evenly tighten. Using proper bolting
techniques, install remaining small cap screws
(key 21), washers, and hex nuts. See Torque
Specification table for proper torque.
14. Place travel indicator assembly in the upper
actuator casing (key 11), if present, and tighten the
travel indicator fitting (key 56).
Type EZL
11
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