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Instruction Manual
D100311X012
actuator. Use lock‐out procedures to be sure that the above measures stay in effect while you work on the
equipment.
2. Remove the tubing or piping from the connection in the top of the spring case adaptor (key 89).
3. If the actuator has a handwheel, rotate the handwheel to relieve all spring compression.
4. Remove the cover band (key 87). Insert a steel rod of approximately 12.7 mm (1/2‐inch) diameter into a hole in the
spring adjustor (key 74), and rotate the spring adjustor from right to left until spring compression is relieved.
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, do not loosen the cap screws on the stem
connector (key 31) when spring force is applied.
5. If necessary, the entire actuator assembly may be removed from the valve by unscrewing the cap screws from the
stem connector (key 31) and removing actuator‐to‐bonnet bolting.
6. Unscrew the diaphragm casing cap screws and nuts (keys 13 and 14), and lift off the upper diaphragm casing (key
1).
7. Unscrew the diaphragm cap screw (key 12), remove the spacer, upper diaphragm plate, diaphragm, and lower
diaphragm plate (keys 2, 4, 3, and 71).
Note
Standard and top‐loaded constructions use the same key numbers for parts. The parts look different, but they use the same
assembly and disassembly sequence. See figure 4, Size 80 Actuator Construction for location of parts.
8. Unscrew the cap screws (key 30), and remove the lower diaphragm casing (key 64).
9. For actuators without a snubber:
a. Unscrew the spring case adaptor cap screws and nuts (keys 90 and 91), and remove the adaptor (key 89) from
the actuator.
b. Remove the snap ring and seal bushings (keys 72 and 7). Inspect, and if necessary, obtain a replacement seal
bushing (key 7). Replace the seal bushing O‐rings (keys 8 and 9) as required. Lubricate with lithium grease (key
237) lubricant.
c. Remove the actuator spring (key 18). Unscrew the cap screws from the stem connector (key 31), and remove the
stem connector. Remove the stem (key 144) and attached spring adjustor, thrust bearing, and spring seat (keys
74, 86, and 19).
10. For actuators with a snubber (see figure 8):
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, ensure the actuator spring is not under
compression before removing the travel stop.
a. Remove the travel stop (key 84). Be certain there is not compression in the actuator spring (key 18). If the
actuator was removed from the valve, secure the stem connector (key 31) to the actuator stem (key 144) to
prevent the stem from turning while unscrewing the stem and piston assembly (key 23).
667 Size 80 and 100 Actuators
May 2011
9
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