9 Trouble-shooting
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BOA-Control/ BOA‑Control IMS
9 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 customer service is required.
Table 17:
Trouble-shooting
Problem
Possible cause
Remedy
Leakage at the seat/disc interface of
BOA-Control/BOA-Control IMS
DN 15 to 200
Rework not possible.
Replace valve.
Leakage at the seat/disc interface of
BOA-Control IMS DN 250 to 350
1. Dismantle the bonnet/cover bolting
(902/920/901).
2. Rework the seating faces of valve
disc and body using a suitable re-
seating tool.
3. Continue re-seating until the
seating faces exhibit a consistently
smooth and even ring.
Leakage at the bonnet gasket of
BOA-Control IMS DN 250 to 350
Unevenly tightened bonnet/cover
bolts
1. Undo the bonnet/cover bolting
(902/920 or 901).
2. Replace the joint ring (411).
3. Re-tighten the bonnet/cover
bolting (902/920 or 901) as specified
in the manual.
Defective bonnet/cover gasket
1. Dismantle the bonnet/cover bolting
(902/920/901).
2. Clean the sealing surfaces.
3. Replace the joint ring (411).
Leakage at the stem seal of BOA-
Control/BOA-Control IMS DN 15 to
200
Rework not possible.
Replace valve.
Leakage at the stem seal of BOA-
Control IMS DN 250 to 350
1. Tighten the stuffing box screws
(45-6) firmly to prevent leakage.
2. Replace the complete upper valve
section immediately.
