Installation, Commissioning and Maintenance Manual
38
PM-GP-006 Page: 1/17
Component: Single-Acting actuator / Double-Acting actuator Task: Pneumatic cylinder and centre body seals replacement
Equipment, Tools, Materials:
Spare seals
Wrench
Lifting tools
Project documentation
Warnings:
Preliminary Operations: Removal from Valve
Description:
Note: the following instructions apply both to Single-Acting and Double-Acting actuator unless otherwise specified.
Cut-off power supply and electric power supply (if present) before performing any operation.
Adequate lifting devices and suitable for the weight must be applied by skilled personnel.
Preliminary actions
1. Remove actuator from valve (par. Removal from Valve, page 11)
2. Position the actuator on a workbench (if possible) or in a stable position and in a clean and closed area
3. Remove any control equipment (if present). Refer to the project specific documentation
4. Remove pneumatic pipes
5.
Hold stop nut (6) with a wrench, unscrew and remove cap nut (4)
6. Remove seal washer (5)
7. Measure length (W)
5
6
W
4
7
5
8. Hold stop bolt (7) with a wrench and loosen stop nut (6)
9. Fully unscrew stop bolt (7)
10. Remove seal washer (5)
If the stop bolt is hard to unscrew, pressurise the cylinder and unscrew
stop bolt by 3-4 turns.
Depressurize the cylinder; check if the stop bolt turns freely. If necessary,
repeat the operation.
Do not unscrew the stop bolt completely while the cylinder
is pressurized.
16.0 Periodic Maintenance
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A4
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