Leslie Controls DIAPHRAGM ACTUATOR 135(R) - Manual (Page 3)

3
starts to move. Take that air pressure and multiply
it by area of actuator (see Table 1) in order to
obtain the force output of spring.
5. Repeat steps 1-4 until desired load is reached.
Actuator Size Stroke
(in)
Area
(in 2 )
Spring Adjustor Rod
Dia. (in)
35 3/4 34
35R 3/4 31
3/4
55 1 57
55R 1 54
7/8
85 2 90
85R 2 87
0.745
135 3 135
135R 3 131
0.995
Table 1- Actuator Load Parameters
OPERATION
Once actuator stroke and spring load have been adjusted,
equipment can be placed into operation. Route air supply
from control system to actuator. Ensure that instrument air
is being used to operate actuator. See equipment instructions
for proper operation of assembly.
MAINTENANCE
General
1. Remove all air and accessories from actuator prior
to removal from equipment.
2. Support actuator prior to removing mounting bolts.
For reverse acting actuators apply air to top of
actuator before removing mounting bolts.
3. Remove actuator mounting bolts.
4. For direct acting actuators, air may need to be
applied to actuator before removing actuator from
equipment shaft. For reverse acting actuators, air
may need to be removed from actuator. Unscrew
actuator from equipment shaft by either spinning
actuator or unscrewing the shaft. (NOTE: If
actuator is mounted to a valve the valve shaft
must not be turned unless valve plug is lifted off
valve seat!)
5. Remove all air pressure from actuator and unload
spring tension by grasping actuator stem with a
wrench and unscrewing spring adjustment nut (40).
(see Fig 3)
6. Actuator is now ready for disassembly.
Direct Actuator Disassembly
(see Fig 1)
1. Remove nuts/bolts (22/23), upper diaphragm case
(20) and diaphragm (21).
2. To remove the other components, lift out
diaphragm disc (24) and entire diaphragm disc and
spring (28) assembly will lift out.
3. Unscrew diaphragm disc nut (16 only showing in
Fig 3) and remove springs (28,29) from the
assembly.
4. Remove spring adjustment nut (35).
5.
Remove lower diaphragm case screws (26).
Direct Actuator Reassembly
(see Fig 1)
See Torque Values in Table 2
1. Install lower diaphragm case bolts (26) and torque
to the values given in Table 2.
NOTE
Spring loads will vary if the actuator is mounted on
equipment that does not fully utilize the entire stroke
length of the actuator.
CAUTION!
Spring load must be completely removed before
proceeding or injury/death can occur.
NOTE
Ensure that all the components being installed are free
from any nicks burrs or defects prior to assembly.