13
and gland packing shall be used whenever the valve is
reassembled.
After reassembly and prior to commissioning / start-up, the
valves shall be subjected to a leak test in accordance with
DIN 3230, Part 3.
9 Trouble
– shooting
9.1 General
KSB valves are robust in design, Nevertheless, malfunctions,
e.g. caused by disoperation, lack of maintenance or improper
use cannot be ruled out completely.
All repair and maintenance work shall be performed by
qualified personnel using suitable tools and original spare
parts.
We recommend having this work performed by our service
personnel. The safety information in section 3 and 8 must be
complied with.
9.2
– Faults > Remedy
- Leakage at the seat
Possible causes:
-
Contamination / solids in the fluid
-
Erosion, corrosion. Abrasion
-
Excessive loads from pipeline forces or thermal
stresses.
>Rework the seat /disc contact faces at the valve disc and
body using a suitable reseating tool after the valve has been
dismantled. The re-seating process of the seat/disc contact
face shall be continuing until the contact faces exhibit a
uniform bright surface.
- Leakage at the cover gasket
Possible causes:
-
Gasket has settled as a result of high temperature
fluctuations
-
Impermissible pressure loads
-
Poor maintenance
-
Poor gasket resistance to temperature and fluid handled
- Bolted bonnet / cover
>Re-tighten the bonnet / cover bolting
>Replace the gasket
After have removed the bonnet / cover bolting (4-5). Clean
the sealing surfaces carefully before inserting a new gasket
- Leakage at the gland packing
Possible causes:
-
Worn packing material
-
Poor maintenance
-
Poor packing resistance to temperature and fluid
handled
>Re-tighten the gland packing at the nuts of the gland
follower. Make sure that the friction forces at the stem do not
increase too much.
>Replace the packing rings of the packing: undo the nuts
and lift off the gland follower.
Clean the gland packing chamber carefully before inserting
new packing rings. Split packing rings shall be inserted in
such a way that the cut edges are offset by 120
”-180”
Do not use additional sealing agent for non-asbestos
gaskets and packing rings. With anti-adhesive coatings, only
use agents explicitly recommended by the sealing element
manufacturer.
If you have any questions, please contact the manufacturer
.
Caution
