12
2 BO 70 en
9
TROUBLESHOOTING
Valve leakage at the shut-off disc
□
No matter what the situation, do not close the valve by
force: irreparable damage may occur if you do so.
□
Check that the energy supply is connected.
□
Check that the closed position of the actuator is in
accordance with the closed position of the disc.
□
Check that the torque of the valve is in accordance with
the following table. (see ???
□
Check the sealing surface of the disc and the sealing ele-
ment for damages. If necessary, dismantle the disc.
□
Check if there is foreign material between the disc and
the sealing element. If necessary, remove foreign mate-
rial or deposits.
□
If necessary, replace the damaged parts
For dismounting see Appendix: maintenance.
Keep in mind the notes in Chapter “Cleaning and mainte-
nance“ in Appendix: maintenance.
Escape of fluid or gas…
at gland packing
Check if the gland is still precompressed by the disc springs.
The disc springs may be damaged. In this case, you must
change them. If the precompression is too minimal, you
must retighten the nuts, but not up to the stop: if you do so,
the disc springs will be damaged. If the precompression of
the disc springs is in order, the gland packing is damaged
and you must change it.
Please see notes for dismounting in Appendix: mainte-
nance.
at the cover plate
Check that all cover screws are tightened well. If necessary,
change the sealing.
Please see notes for dismounting in Appendix: mainte-
nance.
10
SAFETY INSTRUCTIONS
Please pay attention to the following safety instructions
when doing maintenance and when operating the high-
performance disc valve:
1.
Because of safety reasons you are not allowed to carry
out modifications to the method of operation of the
disc valve or its actuator.
2.
Only specialist personnel are allowed to carry out
installation work on the high-performance disc valve.
3.
There is the danger during the functional test that the
high-performance disc valve will move uncontrollably
or suddenly due to the energy supply. Therefore, make
sure that the valve can under no circumstances move
or even tip during the functional test.
4.
Take care during the installation of valves with the
safety position "spring open". If the disc extends over
the installation length of the valve, the valve must be
closed before installation (pneumatically, hydraulically,
etc.).
5.
Make sure in particular that the energy supply is safely
attached and cannot be damaged or torn in any way
during installation.
If the energy supply is suddenly interrupted, the valve
opens abruptly. This can lead to severe injuries and
damage to materials.
6.
During possible maintenance work, there is considera-
ble risk of injury by the accidental use of the remote
control. If you plan remote control for the work using
the high-performance disc valve, make sure that the
energy supply of the actuator is switched off.
7.
Ensure that the cleaning substance cannot cause any
unwanted chemical reactions in connection with pos-
sible residues in the high-performance disc valve.
8.
If you work in the area of the sealing surface of the
disc, secure the disc with wooden wedges to prevent
the risk of crushing. Take care that by doing this the
sealing surface of the disc is not damaged.
9.
If the seals are destroyed by a medium which is too
hot, the medium used could leak at the shaft.
