12
September 2020
Installation, Operation and Maintenance Manual
MAN 571_EAC Rev. 1
Installation
Section 2: Installation
2.2.2
Procedure to Follow If Oil Leaks from the Tanks into the
Pneumatic Valves
NOTICE
If the actuator tanks are kept in horizontal axis by mistake, and the oil inside them enters
into the pneumatic connection pipes and in the control pneumatic valves, it is necessary
to wash with dry air (high flow, low pressure) the interior of valves and pipes: connect an
air or a dry nitrogen supply to the threaded hole of actuator supply and disconnect the
pipes that connect the support plate of control valves to the tanks. Then operate the valves
so that the air flow removes oil, air should go out from the ends of the pipes so to clean
properly also their interior. This operation should be made as soon as possible after the
inconvenience of oil spill.
Checking of the oil level of the bottles (also see Section 5.1.1)
The correct oil level can be verified by means of the oil dipsticks mounted on the top of
each bottle. To do this correctly, we must equalize the oil level of the two bottles:
•
Bring the actuator to the middle of the stroke (45° degrees rotation)
•
Rotate the oil distributor to the equalizing position
•
Wait some minutes, so as the oil can reach for gravity the same level in the
two bottles
•
Rotate again the hydraulic distributor to the position corresponding to the gas
powered operation
After this operation, bring the actuator to the end of the stroke (fully closed or fully open
position) and check, after the gas has been exhausted, the level of the oil by unscrewing
the dipstick. Check that the oil level correspond to the minimum level line, for the tank
wich was pressurized and to the max level line, for the tank which was to exhaust.
I.E. If the actuator is in the closed position, the closing bottle (normally on the left side)
must have the oil at minimum level line; the opening bottle must have the oil at maximum
level line. If the levels are lower than the dipstick lines, add some oil, after checking type
and grade of the oil to be used.
