rotork CQP, Installation Commissioning Maintenance Manual

Page: 28 / 33

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PM-CQP-006 Page:1/2
Item: Actuator (Type B) 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 turning 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 (11)

Remove upper stop bolt (4).
Disassembly of cylinder
• Gradually unscrew hex socket bolt (7) of end flange
(8), following a cross-bolt unscrewing scheme.
• Lift the end flange (8) by means of the lifting lugs.
• Gradually unscrew hex socket bolt (7) of head
flange (1), following a cross-bolt unscrewing
scheme.
• Carefully remove cylinder tube (10) by means of
proper lifting tools.
• Remove piston sliding ring (12) and O-ring (13).
• If O-ring (9) 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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