Servicing; Periodic Tests; Preparing For Maintenance And Conversion Work - Samson EB 31a Mounting And Operating Instructions

9

Servicing

The work described in this chapter may only be performed by
specialist personnel qualifi ed to perform the corresponding task.
The following documents are required in addition for the mainte-
nance of the ball valve:
− Corresponding EB for the installed valve.
DANGER
Risk of bursting due to improper opening of pressurised devic-
es and components!
Pneumatic rotary actuators are pressure equipment that can burst
if handled improperly. Projecting, fl ying components and frag-
ments can cause injuries or even death.
Depressurise the concerned plant parts and the actuator. Also
residual energy must be discharged.
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outdated information.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.
EB 31a_EN
December 2022 edition
Subject to technical changes
NOTE
Damage to the actuator due to excessively high or low tighten-
ing torques!
The rotary actuator components and additional equipment must
be tightened with specifi c torques. Excessively tightened
components are subject to increased wear. Components that are
not suffi ciently tightened can cause the components to release.
Comply with tightening torques, see Chapter "15.1.1
Tightening torques".
Damage to the actuator due to unsuitable tools!
Unsuitable tools can damage the actuator.
Suitable tools are required to work on the actuator, see Figure
15-1 and Table 15-8 in Chapter "15.1.3 Tools".
Damage to the ball valve due to unsuitable lubricants!
Unsuitable lubricants can corrode and damage the surface.
The actuator material requires suitable lubricants, see Table
15-7 in Chapter "15.1.2 Lubricants".
Info
The actuator was checked by PFEIFFER prior to delivery.
− If maintenance and repair work is performed without approval
from the After Sales Service of PFEIFFER, the product guarantee
will be voided.
− Only use original parts from PFEIFFER as spare parts that
correspond to the original specifi cation.

9.1 Periodic tests

Depending on the conditions of use, the actuator must be
checked at defi ned intervals in order to take remedial measures
prior to possible malfunctions. The plant operator is responsible
for preparing a suitable test plan.
Tip
After Sales Service can provide you with support for creating a
test plan specifi c to your plant.
9.2 Preparing for maintenance and
conversion work
Get the material and tools ready that are required for the
work.
Decommission the rotary actuator, see chapter "10 Decom-
missioning".
Disassemble the rotary actuator from the valve, see Chapter
"11.2 Disassembling the actuator".
With preloaded actuators, release the spring tension, see
chapter "11.1 Releasing the spring tension in the actuator".
Servicing
9-1