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Specifications subject without notice
Edition: August 2017
Operating instructions BA 14b-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 before operating the valve.
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
Depending on the design and construction in use, the operating shaft sealings are maintenance free
-
The operating shaft with a PTFE-V-ring pack sealing, is pre-loaded with a spring washer set, and therefore
maintenance free
-
The operating shaft with PTFE-meshwork pack sealing is pre-loaded with a compression spacer and must only be
adjusted when required
Normal manual force is sufficient to operate the manual operation. Turn the handwheel clockwise to close the valve. It is
not permissible to use extensions to increase the operation torque.
Note
Butterfly valves with lever:
The position of the lever indicates the valve’s position:
Lever at a 90° angle to the pipeline:
Valve CLOSED,
Lever parallel to the pipeline:
Valve OPEN.
Danger
Butterfly valves with lever:
Do not open and close the valve with sudden movements, but quick enough to prevent pressure surges and/or
temperature shocks occurring in the pipeline.
Failure to follow these safety precautions may result in personal
injury and can damage equipment installed in the pipeline.
Regular maintenance work on the butterfly valves is not necessary. When checking the pipeline section, make sure that no
medium leaks out at the flanged and threaded ends of the body and 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.
