Series KSE/F, KSE-C/F
Page
16
9530-001-en
Revision 19
TM 9549
Edition 11/2018
8
Malfunctions
♦
Safety valve is leaking
Is there foreign matter between the seat and plug?
Is there any wear or damage to the seat or plug?
Have the nuts at the inlet nozzle been unevenly
tightened?
Actuation of the lifting lever can help to regain the
required sealing effect. If this does not succeed in
stopping the leak, the sealing surface of the plug
must either be reworked or the plug or seat must
be replaced.
♦
The lift given in the test certificate is not achieved
Are the bellows impeded in their movement by
external influences (e.g. foreign matter, solidified
medium between the folds etc.)?
Has the insert sleeve
308
been screwed out of the
thread of the bellows?
For measuring the valve lift, see
Section 9.9.1
.
If the required lift is still not attainable after elimina-
tion of the disorders, an examination at the manu-
facturer's is necessary.
♦
Medium is escaping at the bonnet
Have the hex. socket screws
914/1
not been
tightened?
If, after tightening the screws, tightness still cannot
be restored, either the plastic lining or the bellows
is damaged.
The cause of cracked bellows could have been, for
example, an inadmissibly high back pressure during
operation of the safety valve. Dismantle the safety
valve and have it repaired.
♦
Flange connection ball valve/pipe is leaking
Check the torque of the pipe screws with a torque
wrench. (see
Section 1.3
) If tightness is not
achieved, the recommended torque may be ex-
ceeded by 10%.
If it still proves impossible to stop the leak, then the
lining is damaged. Dismount valve and repair.
♦
The safety valve chatters during discharge
Do the inlet and outlet lines conform to the relevant
regulations?
See also
Section 6.1
and
6.2
.
Is the valve oversized ?
Valves which are too large can subsequently be
adapted to the mass flow reducing the lift. To this
end, the required lift is determined and a travel
stop ring is mounted inside the valve.
