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7
Operation
The work described in this chapter may only be performed by
specialist personnel qualifi ed to perform the corresponding task.
WARNING
Danger of injury due to preloaded springs!
The rotary actuators are tensioned due to the compressed
springs. Furthermore, improper disassembly of the spring car-
tridge can lead to serious injuries.
Opening of the rotary actuator only according to the instruc-
tions, see Chapter "11.1 Releasing the spring tension in the
actuator".
Danger of injury due to escaping exhaust air!
The actuator is pneumatically operated, therefore exhaust air es-
capes after it is controlled.
When working near the actuator, wear eye and hearing pro-
tection.
Danger of crushing due to moving actuator- and switching
shaft!
Before working on the actuator, interrupt and lock pneumatic
energy and the control signal.
Vent the actuator.
Do not allow the jamming of objects to hinder the operation
of the actuator- and switching shaft.
If the actuator- and switching shaft are blocked (e.g. due to
"seizure" if not actuated for a long period of time"), release
the residual energy of the actuator (spring tension) before re-
leasing the blockage, see chapter "11.1 Releasing the spring
tension in the actuator".
Danger of injury due to incorrect operation, use or installation
caused by incorrect information on the actuator!
After performing adjustment or conversion work, the data on the
actuator type plate is no longer correct. This concerns, for exam-
ple, the direction of action and the schematic representation of
the direction of action and actuator function.
Immediately replace the signs or adhesives with incorrect/
outdated information.
Enter the newly adjusted values on the type plate, or request
a new type plate from PFEIFFER.
7.1 Actuator operation
If required, after commissioning and reaching the operating
temperature, tighten all connections, see Chapter "15.1.1
Tightening torques".
The valve/actuator unit must be actuated with the control sig-
nals.
Info
Valves that were delivered from the factory with an actuator are
precisely adjusted. The user is responsible for any changes they
make.
EB 31a_EN
December 2022 edition
Subject to technical changes
The rotary actuator can be operated after connection to the sup-
ply line and adjustment of the rotation angle.
Single-acting rotary actuators with spring return are operated by
an air stroke or spring stroke by pressurising or ventilating the
connection openings.
With double-acting rotary actuators, the connection openings for
the stroke must be pressurised and ventilated alternately for the
stroke, see Chapter "5.4 Establishing the pneumatic connection".
Select the accessories, operating elements, pipes and screw
connections such that they do not restrict the fl ow or cause a
large pressure drop that affects the performance of the rotary
actuator.
Info
If the plant specifi cations require a supply air pressure for the ro-
tary actuator that is lower than the maximum supply air pressure
specifi ed on the actuator type plate, mark the rotary actuator
with the reduced supply air pressure (e.g. "max. supply air pres-
sure limited to ... bar").
Operation
7-1
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