Size 100 Actuator Maintenance; For Actuators Without The Top-Loaded Option - Emerson Fisher Type 667 size 80 Instruction Manuals

Size 100 Actuator Maintenance

For size 100 actuators, refer to figure 5 for part names
and locations. Key number locations for Size 100 ac-
tuators are shown in figure 7.
WARNING
Avoid personal injury from sudden re-
lease of process pressure. Before per-
forming any maintenance operations:
Disconnect any operating lines pro-
viding air pressure, or a control signal
to the actuator. Be sure the actuator can-
not suddenly open or close the valve.
Use bypass valves or completely
shut off the process to isolate the valve
from process pressure. Relieve process
pressure on both sides of the valve.
Drain the process media from both
sides of the valve.
Vent the power actuator loading
pressure and relieve any actuator spring
precompression.
Use lock-out procedures to be sure
that the above measures stay in effect
while you work on the equipment.
1. Isolate the control valve from the line pressure, re-
lease pressure from both sides of the valve body, and
drain the process media from both sides of the valve.
If using a power actuator, also shut off all pressure
lines to the power actuator, release all air pressure
from the actuator. Use lock-out procedures to be sure
that the above measures stay in effect while you work
on the equipment.
2. Remove shroud plate (key 65) by removing the cap
head screws (key 66).
a. For small spring force, loosen jam nut (key
26), and rotate adjusting nut (key 25) until spring
compression is relieved.
b. For high spring force:
To relieve spring compression when
high spring forces exist, refer to the
Spring section, and follow the instruc-
tions given for size 100 actuators with
high spring force. These instructions
Note
Type 667 Sizes 80 & 100
outline the procedure required to de-
crease high spring compression.
Loosen jam nut (key 26), and rotate adjusting nut (key
25) until spring compression is relieved.
3. Remove the pressure tubing or piping from the top
of the diaphragm casing.
4. For actuators with top-mounted handwheel
(see figure 9), rotate handwheel (key 58) clockwise
as far as it will go, unscrew cap screws (key 54), and
remove gear case cover (key 53). Remove travel stop
cap screw, if one is used, from actuator stem exten-
sion (key 36), and unscrew hex nuts (key 47). Un-
screw the cap screws that attach the gear case as-
sembly (key 41) to the actuator, and remove gear
case assembly.
5. If necessary, remove the actuator from the valve
body by separating the stem connector (key 31) and
removing the actuator-to-bonnet bolting. Separate the
stem connector by loosening the stem locknuts (key
69) and unscrewing the four cap screws.
If the actuator has been removed from
the valve, ensure that it is in the vertical
position. Then, block the actuator stem
(key 144) to support the weight of the
actuator stem, spring seat and spring
(keys 144, 19, and 18). This will facilitate
removal of the nut (key 24) or actuator
stem connector (key 31, figure 8).
For Actuators Without the Top-Loaded
Option
Disassembly
Part names and locations are shown in figure 5. Size
100 actuator key number locations are shown in figure 7.
1. Unscrew diaphragm casing cap screws and nuts
(keys 13 and 14) and remove upper diaphragm casing.
2. For actuators without a top-mounted hand-
wheel, unscrew and remove travel stop cap screw
(key 12), if one is used, and hex nut (key 24).
3. For actuators with a top-mounted handwheel
(see figure 9), remove hex nut, actuator stem exten-
sion, and actuator stem connector (keys 28, 36, and
42).
4. Remove washer, upper diaphragm plate, dia-
phragm, diaphragm retainer, and backup plate (keys
37, 4, 3, 5 and 6).
5. Unscrew six cap screws (key 11), and remove seal
bushing retainer (key 10). Remove seal bushing (key 7).
Note
9