PAGE B18
12. Relieve the pressure to the diaphragm.
13. Attach the pointer to the stub shaft.
14. Install any accessories removed.
15. Check the open and closed position stops and readjust if
necessary.
16. Pipeline flow may now be restored.
SPRING ASSEMBLY REPLACEMENT
1. Stop pipeline flow. Pipeline flow must be stopped before
actuator disassembly to prevent flow system damage and/or
personal injury.
2. Remove the two pointer screws and the pointer.
3. Apply approximately 10 psi air pressure to the diaphragm,
then remove the cast housing cover. Removal or installation of
the housing cover without pressure on the diaphragm is very
difficult and could result in damage to the actuator or valve.
4. Remove the shoulder screw from the link arm.
5. Relieve the air pressure to the diaphragm.
6. Disconnect the actuator piping.
7. Remove three of the bolts that fasten the diaphragm
cover to the spring case. Equally space the bolts as shown in
Figure 1.
8. For size 40 actuators, use 1/4” threaded rod, 3” long. For
size 55 and 85 actuators, use 3/8” threaded rod, 8” long.
Install the threaded rod about in each of the three holes, then
install and tighten nuts on each end of the rods. Refer to
Figure 1, PAGE B14.
9. Remove the remaining diaphragm cover bolts.
10. Slowly and evenly back out the nuts on the threaded rod
until all the spring pressure is relieved, then remove the nuts
and diaphragm cover.
11. Remove the rubber diaphragm.
12. Pull the spring assembly out of the spring case.
UNDER NO CIRCUMSTANCE IS THE SPRING
ASSEMBLY TO BE DISASSEMBLED. DISAS-
SEMBLY COULD RESULT IN PERSONAL INJURY.
WARNING
THIS ACTUATOR CONTAINS A COMPRESSED
SPRING. THE POTENTIAL FOR PERSONAL INJURY
EXISTS DURING THE DISASSEMBLY/REAS-
SEMBLY PROCESS. CAREFULLY FOLLOW THESE
INSTRUCTIONS TO ENSURE YOUR SAFETY.
13. Remove the rod end from the old spring assembly and
screw it into the new spring assembly until about 1/4” of
threads remain showing.
14. Slide the new spring assembly into the spring case so the
two pins in the spring fit into the two holes in the housing
15. Place the diaphragm on the spring case, then set the
diaphragm cover on the diaphragm.
16. Fasten the spring case, diaphragm and diaphragm cover
together using bolts and nuts, in the reverse of the removal
sequence descibed in 7,8,9,10 above. .Place the CAUTION
tag under one of the bolts.
17. Connect the actuator piping.
18. Apply air pressure to the diaphragm to slide the rod end
into the link arm slot; secure the rod end in place by installing
the shoulder screw.
19. Make sure the stub shaft 0-ring is in place, then place the
gasket and cover on the housing.
20. Relieve the pressure to the diaphragm.
21. Attach the pointer to the stub shaft.
22. Check the open and closed position stops and readjust if
necessary.
23. Pipeline flow may now be restored.
DIAPHRAGM REPLACEMENT
1. To disassemble, follow Steps 1 thru 11 in the REPLACING
THE SPRING ASSEMBLY Section of this Instruction.
2. To reassemble, follow Steps 15 thru 23 in the REPLACING
THE SPRING ASSEMBLY Section of this Instruction.
REVERSING THE ACTION
1. Stop pipeline flow. Pipeline flow must be stopped before
actuator disassembly to prevent flow system damage and/or
personal injury. Refer to Figure 2, Page B15.
2. Remove the two pointer screws and the pointer.
3. Apply approximately 10 psi air pressure to the diaphragm,
then remove the cast housing cover. Removal or installation of
the housing cover without pressure on the diaphragm is very
difficult and could result in damage to the actuator or valve.
4. Remove the shoulder screw from the link arm.
5. Relieve the air pressure to the diaphragm.
6. Disconnect the actuator piping.
7. Remove the actuator from the adaptor.
8. Loosen the two cap screws on the link arm.
9. Mark the position of the link arm on the shaft. Remove
the link arm, rotate it 180 degrees from its previous position,
then reinstall it on the valve.
