8 Trouble-shooting
29 of 50
8417.8/20-EN
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.
If problems occur that are not described in the following table, consultation with the
KSB service is required.
Table 8:
Trouble-shooting
Problem
Possible cause
Remedy
Valve noise
Unfavourable installation position
causing unfavourable flow around
or inside the valve (e.g. insufficient
downstream stabilisation distance,
etc.)
Change installation position.
Valve operated beyond its design
limits
Check design data and/or operating
data; change flow resistance of valve.
Valve cannot be actuated.
Foreign matter jammed in the seat
area
Flush valve, dismantle, if necessary, and
remove foreign matter.
Gearbox is blocked.
Deblock / replace.
Electric actuator is not connected or
damaged.
Connect to power supply. Replace
actuator.
Unfavourable flow conditions and
restricted movement
Change installation position.
Leakage at the seat/disc interface
Valve not fully connected.
Fully connect valve.
Liner and disc damaged or worn
Replace liner and disc.
Liner displaced but not damaged
Re-insert liner.
Shaft broken or warped
Replace the shaft.
Valve disc broken or warped
Replace or repair the valve.
Cavitation inside the valve
Valve operated beyond its design
limits
Valve unsuitable; replace with suitable
valve or change operating conditions.
Operating data changed
Leakage at the body
Body fractured
Replace valve.
High external forces
Replace valve; check for surge pressure.
High actuating forces
Deposits at valve seat
Flush valve, dismantle, if necessary, and
clean seat area.
Dry piping environment, i.e. valve is
not in contact with fluid handled.
Verify contact with fluid handled.
Summary of Contents for BOAX-B
Page 1: ...Butterfly Valve Installation Operating Manual ...
Page 49: ......