Richter GU/F Series, Installation And Operating Manual

Page: 14 / 28

Series GU/F
Page
14
9530-020-en Revision 15
TM 10477 Edition 05/2022
8 Malfunctions
♦
Overflow valve is leaking
Is there foreign matter between the seat and plug?
Is there any wear or damage to the seat or plug?
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 9.7.1 .
If the required lift is still not attainable after
elimination of the disorders, an examination at the
manufacturer'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 overflow valve. Dismantle
the overflow 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 1.1 ) 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 overflow 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.