KSB ECOLINE FYC, Operating Manual

Page: 90 / 100

8 Trouble-shooting
90 of 100
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 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 104: Trouble-shooting
Problem Possible cause Remedy
Leakage at the seat
▪
Contaminations or solids in the
fluid
▪ Erosion, corrosion or abrasion
▪ Excessive loads from pipeline
forces or thermal stresses
1.
Dismantle the bonnet/cover bolting
(902.1/920.1).
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 gland packing Unevenly tightened gland packing
1.
Re-tighten the hexagon nuts
(920/920.2) as specified in the
manual.
Defective gland packing
1.
Undo hexagon nuts (920/920.2).
2.
Lift the gland follower (452).
3.
Clean the gland packing chamber.
4.
Insert split packing rings in such a
manner that the cut ends of the
rings are offset by between 120° and
180°.
Leakage at bonnet/body joint or
cover/body joint (bolted bonnet/
cover design) Unevenly tightened bonnet/cover
bolts
1.
Re-tighten the bonnet/cover bolting
(902.1/920.1) as specified in the
manual.
Defective bonnet/cover gasket
1.
Dismantle the bonnet/cover bolting
(902.1/920.1).
2.
Clean sealing surfaces.
3.
Replace the joint ring (411).
The tightening torques must be
observed.
Leakage at the bonnet/body joint or
cover/body joint (for pressure seal
design) Unevenly tightened hexagon head
bolts.
1.
Re-tighten the hexagon head bolts
(901.1/920.1) as specified in the
manual.
Defective joint ring
1.
Remove pressure seal bonnet/cover.
2.
Clean sealing surfaces.
3.
Replace the joint ring (411.1).
The tightening torques must be
observed.