rotork CQP, Installation Commissioning Maintenance Manual

Page: 25 / 33

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PM-CQP-004 Page:1/2
Item: Actuator (Type A) Task : Cylinder seals replacement- Piston seals
Equipment, Tools, Materials :
Lifting equipments
Spare parts
Warnings :
Preliminary Operations : Removal from valve, PM-CQP-003
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) .
Before executing this procedure verify connecting screws (14) are correctly assembled and tightened on enclosure flange.
Disassembly of the stop bolt
Ensure that the turning flange is correctly assembled
and tightened before proceeding.
The actuator must be in vertical position.

Hold the stop nut with a wrench, then unscrew
and remove cap nut (1).

Remove O-ring (2).

Measure the distance between the upper stop
bolt and the end flange (2) surface. This
measure will be useful during re-installation.

Hold upper stop bolt (4) with a wrench and
unscrew locking nut (5)

Remove O-ring (6).

Unscrew and remove stopper plug (3)

Remove O-ring (17)

Remove upper stop bolt (4).
Disassembly of cylinder
Ensure that the turning flange is correctly assembled
and tightened before proceeding.
The actuator must be in vertical position.
• Unscrew hex socket bolt (7).
• Unscrew tie rods (8).
• Lift the end flange (9) and cylinder tube (11) by
means of the lifting lugs.
• Remove piston sliding ring (12) and O-ring (13).
• If O-ring (10) is damaged, replace it.
Seals substitution
• 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.
• Lubricate all sliding parts with a recommended
grease film.
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