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10
Trouble shooting
10.1
General
All repair and service work must be carried out by qualified personnel using suitable tools and genuine spare parts.
The previous safety instructions must be observed.
10.2
Faults & Remedies
Downstream/Upstream leakage
Shaft leakage
Flange leakage
Over torque
No opening
No closing
Hard point
Vibration / Fluttering
Foreign particles in the valve
Actuator on safe position
-- Open the valve, line without fluid or flow, remove the particle
-- inspect liner/disc
-- replace liner/disc
Broken body
Defect due to water hammer
Search for the reasons.
Replace / Repair the valve
Broken or warped disc
Defect due to water hammer
Search the reasons. Replace / Repair the valve
Damaged disc, corroded disc
Adjusting bottom screws
Disc : check flanging dimensions and replace using the disc kit
Adjust bottom screws
Broken shaft, twisted shaft
Analyse the defect / research of causes / replace shaft
Worn out liner
Replacement liner (liner kit)
Receding liner, damaged liner
If the liner is undamaged : separate the pipe flanges / remove valve /
put it back between the pipe flanges / check operations.
Wrong flanging
Check type and flange bolting torque
Wrong flanging size
Follow instructions given in KSB technical leaflet
Wrong face to face,
non parallel flanges
Flanging has to be modified in accordance with KSB technical leaflet
requirements.
Flow conditions
Wrong operating conditions
Check the technical offer versus service conditions
Damaged actuator
Check sizing versus operating conditions (see KSB)
