KSB BOA-CVP H, Installation & Operating Manual

Page: 31 / 40

8 Trouble-shooting
31 of 40
BOA-H Mat P
8 Trouble-shooting
WARNING
Improper remedial work on the valve
Risk of injury!
▷ For any work performed in order to remedy faults on the valve observe the
relevant information given in this operating manual and/or the product
literature provided by the accessories manufacturers.
Malfunctions e.g. caused by incorrect operation, lack of maintenance or improper use
cannot be ruled out completely. All repair work and maintenance work must be
performed by skilled, properly trained personnel using suitable tools and original
spare parts.
NOTE
If problems occur that are not described in the Trouble-shooting table of the
individual operating manuals, consultation with KSB is required.
Table 10: Trouble-shooting
Fault Possible cause Remedy
Leakage at the bonnet/cover Defective bonnet/cover gasket Replace bonnet/cover gasket.
Unevenly tightened bonnet/cover bolts Undo the bonnet/cover bolts, fit a new
gasket and re-tighten the bolts as
specified in the manual.
▪
Undo bonnet/cover bolting 902/920.
▪ Replace joint ring 411.
▪ Tighten bonnet/cover bolting
902/920 to the specified tightening
torque.
Leakage at the stem PTFE V-packing set is damaged. Replace V-packing set.
Insufficient stuffing box screw pressure
on graphite gland packing
▪
Tighten stuffing box screw 45-6 to
the specified tightening torque.
▪
If leakage continues, replace the
gland packing.
No throughflow Valve is closed. Open the valve.
Closed shut-off valve in the piping Open the shut-off valve.
Little throughflow Piping clogged Check piping.
Leakage at seat/disc interface Worn seating surfaces on the valve disc Fit a new valve disc.
Worn seating faces on valve seat Replace the body.
Sealing elements of design variants are
worn. Fit new sealing elements.
Actuator too weak Check closing torque of actuator; use a
stronger actuator if necessary.
Contamination between valve disc and
seat Clean valve trim.
Jerky and/or extremely sluggish
stem movement Stuffing box screw tightened too hard
on graphite packings Check tightening torque, loosen if
required.
Bearing damage Replace defective parts.