Dwyer LIN-E-AIRE® - Manual (Page 9)

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4.3.2 Air-to-Raise Actuator
1. Isolate or bypass the control valve in pipe line.
2. Shut off pressure to actuator and disconnect air line.
3. Turn range spring adjusting screw clockwise to relieve all
spring compression.
WARNING: If all spring compression is not relieved, serious injury
can occur when removing spring and diaphragm casing.
4. Loosen and remove all diaphragm casing mounting bolts, nuts
and washers, Figure 9.
5. Lift off spring and diaphragm casing from actuator assembly.
6. Remove old diaphragm and discard.
7. Install spring and diaphragm casing with new diaphragm on
actuator assembly. Fasten with bolts, nuts and washers removed
in Step 4.
8. Reconnect pipe or tubing to pressure connection in yoke.
9. Readjust actuator travel, refer to 3.2 Adjusting Actuator Range.
4.4 Changing Actuator Range Spring
4.4.1 Air-to-Lower Actuator
1. Isolate or bypass the control valve in pipe line.
2. Shut off pressure to actuator and disconnect air line.
3. Turn range spring adjusting screw counterclockwise to relieve
all spring compression.
WARNING: If all spring compression is not relieved, serious injury
can occur when removing upper diaphragm casing.
4. Loosen and remove all diaphragm casing mounting bolts, nuts
and washer, Figure 8.
5. Lift off upper diaphragm casing and diaphragm from actuator
assembly.
6. Loosen valve stem locknut just enough to unscrew push rod
with push plate from valve stem.
CAUTION: Do not rotate valve plug on seat ring. It may be nec-
essary to use pliers to hold valve stem. If necessary, grip stem
near threads to avoid scoring stem.
7. Remove push rod and push plate with range spring from actu-
ator assembly.
8. Install new range spring with push rod and push plate in actu-
ator assembly.
9. Screw push rod on to valve stem on top of stem locknut and
tighten locknut.
10. Install diaphragm casing with diaphragm on actuator assem-
bly. Fasten with the bolts, nuts and washers removed in Step 4.
11. Reconnect pipe or tubing to pressure connection in upper
diaphragm casing.
12. Readjust actuator travel, refer to 3.2 Adjusting Actuator
Range.
4.4.2 Air-to-Raise Actuator
1. Isolate or bypass the control valve in pipe line.
2. Shut off pressure to actuator and disconnect air line.
3. Turn range spring adjusting screw clockwise to relieve all
spring compression.
WARNING: If all spring compression is not relieved, serious injury
can occur when removing spring casing.
4. Unscrew spring casing with adjusting screw from diaphragm
casing, Figure 9.
5. Remove old range spring and install new spring.
6. Screw spring casing with adjusting screw onto diaphragm cas-
ing.
7. Reconnect pipe or tubing to pressure connection in yoke.
8. Readjust actuator travel, refer to 3.2 Adjusting Actuator Range.
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