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PM-CQP-003
Page:1/1
Item:
Actuator (Type A)
Task
:
Cylinder seals replacement- Turning flange
Equipment, Tools, Materials
:
Lifting equipments
Spare parts
Warnings
:
Preliminary Operations
:
Description:
Cut-off power supply and electric power supply (if present) before performing any operation
.
Remove the actuator from valve, according to instructions in par. Removal from valve, page 10.
Task shall be executed in a workshop in a clean area, free of dust.
Position the actuator on a workbench.
Actuator must be in its safety position, spring relaxed (in case of single effect)
.
Disassembly of turning flange.
Before proceeding with the following operation ensure that the cylinder group is completely assembled.
Don’t execute the following operation if tie rods or any other part of the cylinder group are disassembled or unscrewed.
•
Place the actuator on a proper bench in horizontal
position.
Seals substitution
•
Unscrew hex socket bolt (14).
•
Remove turning flange (15).
•
Remove O-ring (16).
•
Carefully clean the seals groove.
•
All the removed parts should be thoroughly cleaned, inspected
and de-burred as necessary.
•
Replace all the mentioned seals and lubricate them with a
grease film.
Reassembly
•
With the actuator in horizontal position, reinstall turning flange
(15) with O-ring (16).
•
Reinstall and tighten hex socket bolt (14) according to the
recommended torque and following a “cross bolt torque
tightening” sequence.
Final testing
The actuator must be tested.
•
Place the actuator in a stable position, e.g. on a workbench.
•
Connect the pneumatic supply to the actuator and cycle the
actuator several times, in order to check if it works smoothly
and if there are any leakages through the seals.
•
Check if the painted parts have been damaged during
disassembly and/or reassembly. If necessary, repaint them in
accordance with the applicable painting specifications.
