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Installation, Operation and Maintenance Manual
MAN 607 Rev. 6
February 2022
Section 5: Maintenance
Maintenance
Anyway every 2 years of operation, the following is recommended:
•
Check that the actuator operates the valve correctly and with the required
operating times. If the actuator operation is very infrequent, carry out a few
opening and closing operations with all the existing controls (remote control, local
control, emergency controls, etc.), if this is allowed by the conditions of the plant.
•
Check that there are no hydraulic leakages. If necessary, tighten the nuts of
the pipe-fittings.
•
Check oil level (Figure 28) into the hydraulic control unit (see Section 5.1.1).
•
Check that the actuators did not undergo accidental damage with oil leakages
found on site.
•
Check that improper closing of control group cover (if present) did not produce
the presence of condensation on it.
•
Check the integrity of worn-out parts (gaskets, pads, etc.).
•
If there is an oil filter on the actuator, bleed the condensed water accumulated
in the cup by opening the drain cock. Disassemble the cup periodically and wash
it with soap and water; disassemble the filter; if this is made up of a sintered
cartridge, wash it with nitrate solvent and blow through with oil. If the filter is
made of cellulose, it must be replaced when clogged.
Figure 28
Level measuring stick
Figure 29
Maximum level
Minimum level
5.1.1
Check and Restore Oil Level in the Hydraulic
Manual Override
(refer to Section 7.2, Figure 38)
Operate the distributor lever to “closing manual operation”.
