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Specifications subject without notice
Edition: August 2017
Operating instructions BA 26l-02_EN
5. Pressure check in pipeline section
The pressure check of valves has already been carried out by the manufacturer. To check the pressure of a section of pipeline
with installed valves, the following points must be observed:
Carefully flush newly installed pipes to remove any foreign material.
Valve OPEN:
The test pressure should not exceed the value
1.5 x PN
(see nameplate).
Valve CLOSED:
The test pressure should not exceed the value
1.1 x PN
(see nameplate).
If a valve leaks, see section 7 <Troubleshooting>.
6. Standard operation and maintenance
Normal manual force is sufficient to operate the manual operation. It is not permissible to use extensions to increase the
operating torque.
The shaft is sealed with a V-ring packing preloaded with a set of spring washers and does not require any maintenance.
Regular maintenance work on the ball valves is not necessary. But, on checking the pipeline section, there should be no
leakage at the flanged and bolted connections of the valve body or at the shaft packing.
If a valve leaks, proceed as described in section 7 <Troubleshooting>.
7. Troubleshooting
Observe the safety instructions listed in section 2 on troubleshooting.
Warning
To remove a valve from a pipeline containing dangerous media and to take it out of the plant:
Decontaminate the valves properly first.
Type of fault
Action to be taken
Comment
Leak at the connection
to the pipeline
Tighten flange bolts.
If the medium leaks out at the flanges even after tightening the flange bolts:
Remove the valve (observing the instructions in section 2.3 <Particular hazards>)
and replace the gaskets.
Note 1:
When ordering spare parts,
include all the specifications
listed in the valve designation.
Only use original parts from
Pfeiffer.
Note 2:
If, after removing the valve
from the pipeline, it is found
that the body and/or internal
parts are not sufficiently
resistant to the process
medium, select parts made of
a suitable material.
Leak at the connection
between valve body
parts
Tighten bolts/screws with a torque wrench, see Pfeiffer repair instructions <
EB26l
>
If the valve still leaks:
Remove the valve (observing the instructions in section 2.3 <Particular hazards>)
and replace the gaskets. Contact Pfeiffer for spare parts and necessary instructions.
Leak at the shaft
packing
Remove the valve (observing the instructions in section 2.3 <Particular hazards>),
dismantle the valve and replace the shaft packing. Contact Pfeiffer for spare parts
and necessary instructions.
No tight shut-off when
the valve is closed
Remove the valve (observing the instructions in section 2. 3 <Particular hazards >)
and check it.
If the valve is damaged:
If it must be repaired, remove the valve, observing section 2.3 <Particular hazards>.
Contact Pfeiffer for spare parts and necessary instructions.
Malfunction
If the valve is damaged:
If it must be repaired, remove the valve, observing section 2.3 <Particular hazards>.
Contact Pfeiffer for spare parts and necessary instructions.
If a pneumatic actuator
with springs must be
removed from the valve
Caution:
Risk of injury
Before removing the actuator from the valve, disconnect the
signal pressure.
