Air Torque AT045U, Mounting And Operating Instructions

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EB AT-RP-4GU EN 9-1
Service
9 Service
The work described in this section is only to be performed by
fully trained and qualified personnel.
Risk of bursting due to incorrect opening of pressurized
equipment or components.
Pneumatic actuators are pressure equipment that may burst
when handled incorrectly. Flying projectile fragments or com-
ponents can cause serious injury or even death.
Î
Before starting any work on the actuator disconnect all
pneumatic / hydraulic / electrical supplies and discharge
the pressure from the actuator.
Risk of personal injury due to preloaded and compressed
springs.
End caps are under tension due to compressed springs.
Furthermore incorrect spring cartidges disassembly could re-
sult in serious injury.
Î
Before starting any work on the actuator disconnect all
pneumatic / hydraulic / electrical supplies and discharge
the pressure from the actuator.
Î
Make sure that the actuator is in the closed position (0°)
while disassembling the end caps and the stop screws ha-
ve been correctly removed.
Î
Do not disassemble individual spring cartridges.
Î
If spring cartidges service is necessary, contact AIR TOR-
QUE.
Crush hazard arising from moving parts.
The actuator and the valve assembly contains moving parts,
which can injure hands or
fi ngers.
Î
Do not touch or insert hands or fi nger into moving parts.
Î
Before starting any work on the actuator disconnect all
pneumatic / hydraulic / electrical supplies and discharge
the pressure from the actuator.
Risk of actuator damage due to excessively high or low tigh-
tening torques.
Observe the speci fi ed torques on tightening actuator compo-
nents (bolts and nuts). Excessive tightening torques lead to
parts wearing out quicker. Parts that are not tightened enough
may loosen.
Î
Observe the speci fi ed tightening torques in section 15.2.
− The product warranty becomes void if service or repair
work not described in these instructions is performed without
prior agreement by AIR TORQUE‘s After-sales Service.
−
Only use original spare parts by AIR TORQUE, which com-
ply with the original speci
fi cations.
DANGER
!
WARNING
!
WARNING
!
NOTICE !
Note
With the information given below, AIR TORQUE provides the
end user with all the required information necessary for ser-
vice.
Under normal conditions, the actuator requires only periodic
observation to ensure proper operation. However, due to criti-
cal working conditions and a natural components ageing ef-
fect even if properly stored, a preventive service program is
essential to ensure good performance, safe operation and an
extended life of the actuator. AIR TORQUE recommend to per-
form the service not later than reaching the first limit between
cycles number limit and time limit. One cycle consists of nomi-
nal 90° angular travel in both directions (i.e. 90° to open +
90° to close).
Î Spare kits are available for seals and bearing replace-
ment. (refer to the ‘Part list‘ in section 9.2)
Î
Refer to the Rubber products storage instructions (T3.3.3.1
EN).
Table 9-1
ACTUATOR OUTPUT
TORQUE RANGE CYCLES NUMBER
LIMIT TIME LIMIT
Up to 125 Nm 500.000 48 Months/ 4 years
from installation
or
60 Months/5 years
from production da-
te.
125 Nm ÷ 500 Nm 350.000
500 Nm ÷ 1000 Nm 250.000
1000 Nm ÷ 3000 Nm 100.000
3000 Nm ÷ 8000 Nm 50.000
8000 Nm ÷ 16000 Nm 30.000
Cycles number limit and time limit have been defined for actu-
ators with sizing safety factor at least 1.3 and operating at
specific conditions:
−
Supply pressure
≤
5,5 bar.
−
Supply media: air or inert gas, not corrosive, dry or light-
ly lubrified, without impurity.
−
Working temperature from 10°C up to 30°C.
Any deviation from these operating conditions may affect the
recommended cycles number limit and time limit.
Î
For actuators with “HT“ or “LLT2“ operating temperatures
(refer to section 3.3 ‘Technical data‘) the recommended
cycles number and time limit may be reduced by 50%.
Î
For actuators operating in Safety instrumented systems
where a certain SIL level is required, cycles number limit
and time limit may be signi
fi cantly reduced.
9.1 Preparation for servicing
1. Lay out the necessary material and tools to have them rea-
dy for the intended work.
2. Put the actuator out of operation referring to section 10
‘Decommissioning‘.
3. Remove the actuator from the valve referring to section 11
‘Removal‘.
Note