KSB BOAX- B, Operating Instructions Manual

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42
Downstream/Upstream leakage
Shaft leakage
Flange leakage
Over torque
No opening
No closing
Hard point
11 Trouble shooting
11.1 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.
11.2 Faults & Remedies
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)
BOAX - B Mat P
Pneumatic actuator Check the red air pressure
BOAX - B Mat P
Pneumatic actuator No correct adjustment of the closing adjusting screws
Please adjust in accordance with this document
BOAX - B Mat P
Pneumatic actuator Damaged actuator : change the actuator