Emerson Process Management 667 - Manual (Page 17)

Instruction Manual
D100311X012
667 Size 80 and 100 Actuators
May 2011
17
15. Once completed, no more tightening is recommended.
16. For actuators with a top‐mounted handwheel (see figure 9), mount the gear case assembly (key 41) on the
actuator using the cap screws (key 16). Install the hex nuts (key 47) and travel stop cap screw (if used) on the
actuator stem extension (key 36). Install the gear case cover (key 53) with the cap screws (key 54).
17. Mount the actuator on the valve, and secure with the actuator‐to‐bonnet bolting. Refer to the Installation section
to connect the actuator stem to the valve plug stem.
For Actuators With the Top‐Loaded Option
Disassembly
For key number locations refer to figure 7, and refer to the Top‐Loaded Actuator Detail shown in figure 7. Also, refer to
figure 5 for diaphragm construction details.
1. Remove the 40 cap screws (key 13) from the upper diaphragm casing (key 1) and remove the casing.
2. Remove the travel stop cap screw (key 12), hex nuts (key 24 and 241), washer (key 37), backup plate (key 6),
diaphragm retainer (key 5), diaphragm (key 3), and diaphragm backup plate (key 246) with O‐ring (key 240).
3. Remove the 40 cap screws (key 13) from the lower side of the casing adaptor (key 245) and remove the adapter.
4. Remove the diaphragm plate (key 4) with O‐ring (key 240), diaphragm (key 3), diaphragm retainer (key 5), and
backup plate (key 6).
5. Unscrew the six cap screws (key 11) and remove the seal bushing retainer (key 10). Remove the seal bushing (key
7). Remove and replace the seal bushing O‐rings (keys 8 and 9) as necessary.
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, do not loosen the four hex nuts on the lower
diaphragm casing when spring pressure is applied. Ensure that all spring precompression has been released.
6. Unscrew the four hex nuts that secure the lower diaphragm casing to the yoke assembly (key 67) and remove the
lower diaphragm casing. Replace the yoke assembly O‐rings (key 70) as necessary.
7. The actuator spring (key 18) and stem (key 144) can now be removed if necessary. Be sure to disconnect the stem
connector (key 31) before removing the stem.
8. Unscrew the six cap screws (key 11) and remove the seal bushing retainer (key 10). Remove the seal bushing (key
7). Remove and replace the seal bushing O‐rings (keys 8 and 9) as necessary.
9. Unscrew the four hex nuts that secure the lower diaphragm casing to the yoke assembly (key 67) and remove the
lower diaphragm casing. Replace the yoke assembly O‐rings (key 70) as necessary.
10. The actuator spring (key 18) and stem (key 144) can now be removed if necessary. Be sure to disconnect the stem
connector (key 31) before removing the stem.
11. Refer to the size 100 actuator assembly procedures. Carefully clean and inspect all parts, and obtain any
replacement parts required for reassembly.
Assembly
1. If the actuator stem (key 144) was removed, lubricate the threads on the stem with lithium grease lubricant (key
237).
2. Assemble the hex nuts, thrust bearing, and spring seat (keys 26, 25, 86, and 19) to the stem. Be certain that the
thrust bearing race with the larger inside diameter faces the spring seat. Rotate the adjusting nut (key 25) to
position the spring seat 305 mm (12 inches) from the end of the stem.