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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:
− Installation and operating manual for the installed actuator,
e.g
EB 31a for BR 31a rotary actuators or the correspond-
ing actuator documentation of other manufacturers.
WARNING
Danger of burning due to hot or cold components and pipe!
Ball valve components and pipes can become very hot or very
cold during operation and cause burns upon contact.
Let the components and pipes cool down or warm up.
Wear protective garments and protective gloves.
Danger of injury due to pressurised components and escaping
medium!
Do not loosen the screw of the optional test connection while
the ball valve is pressurised.
Danger of crushing due to moving actuator- and control shaft!
Do not reach into the bracket as long as the pneumatic pow-
er is connected to the actuator.
Before working on the ball valve, interrupt and lock pneumat-
ic energy and the control signal.
Vent the actuator.
Do not allow the jamming of objects in the bracket to hinder
the operation of the actuator- and control shaft.
If the actuator- and control 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 the corresponding actuator docu-
mentation.
Prior to disassembly of the actuator, bring the ball valve into
the fail-safe position.
Danger of injury due to escaping exhaust air!
During operation, when regulating or when opening and closing
the ball valve, exhaust air can escape, for example from the ac-
tuator.
Wear eye protection and, if necessary, hearing protection
when working near valves
Danger of injury due to preloaded springs!
Actuators with preloaded actuator springs are pressurised.
Release the compression from the preloaded springs before
working on the actuator, see the corresponding actuator doc-
umentation.
Danger of injury due to residual medium in the ball valve!
When working on the ball valve, residual medium can escape
and, depending on the medium properties, cause injuries (e.g.
scalding, chemical burns).
Wear protective garments, protective gloves and eye protec-
tion.
Do not loosen the screw of the optional test connection while
the ball valve is pressurised.
Bring the ball valve into the open position so the pressure is
released from the ball.
EB 20a_EN
November 2023 edition
Subject to technical changes
NOTE
Damage to the ball valve due to excessively high or low tight-
ening torques!
The ball valve components must be tightened with specifi c tor-
ques. Excessively tightened components are subject to increased
wear and can damage the plastic lining. Insuffi ciently tightened
components can cause leakage.
Observe the tightening torques, see Table 15-1 in Chapter
"15.1.1 Tightening torques".
Damage to the ball valve due to unsuitable tools!
Only use tools approved by PFEIFFER, see Chapter "15.1.3
Tools".
Damage to the ball valve due to unsuitable lubricants!
Only use lubricants approved by PFEIFFER, see Chapter
"15.1.2 Lubricants".
Info
The ball valve was checked by PFEIFFER prior to delivery.
− Certain test results certifi ed by PFEIFFER are no longer valid
when disassembling the ball valve. This includes the test for
seat leakage and the leak test (outer tightness).
− 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 cor-
respond to the original specifi cation.
− Wear parts are not covered by the warranty.
9.1 Periodic tests
Depending on the conditions of use, the ball valve must be
checked at defi ned intervals in order to take remedial meas-
ures prior to possible malfunctions. The plant operator is re-
sponsible for preparing a suitable test plan.
PFEIFFER recommends the following inspections that can be
carried out during operation:
Test
If present, check the optional
test connection for tightness.
WARNING! Danger of injury
due to pressurised components
and escaping medium! Do not
loosen the screw of the test con-
nection while the ball valve is
pressurised.
Check the control shaft sealing
for tightness from the outside.
Servicing
Measures in the case of a negative
test result
Decommission the ball valve, see
chapter "10 Decommissioning".
Contact the After Sales Service at
PFEIFFER for repairs, See chapter "12
Repairs".
The control shaft sealing with a PTFE
V-ring packing is preloaded with a
disc spring set and is therefore main-
tenance free.
9-1
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