Chapter 6. Disassembly and Reassembly of Model PSA
Actuator
6-1. Disassembly of the Actuator
Precautions
• All the nuts for the eyebolts are stainless steel. Do not mix them up with other nuts.
• Place the removed parts in a clean place.
• Stand the actuator up vertically during disassembly.
• For actuators that are equipped with a side handlheel, refer to "6-4. Removing the Side
Handwheel from the Actuator".
• Release the air in the diaphragm case before disassembly.
WARNING
Do not disassemble the pneumatic actuator while supply air pressure is
being applied. The compressed air may cause an injury.
CAUTION
Dispose of old parts that were replaced during valve disassembly or main-
tenance as industrial waste. If they are burned or discarded carelessly, envi-
ronmental pollution will result.
Disassembly procedure
Check the size of the actuator and disassemble it, referring to
Figure 6-1 to Figure 6-4.
(1) Marking and parts protection
Step Procedure
1 Place matching marks on the upper and lower diaphragm case and on the boss of the
yoke for remounting the case.
2 Wrap plastic tape around the threads of the rod to protect the sealing parts and the
bushing.
6-1
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