Stafsjö WB11, WB, WB12, WB14 Maintenance Instructions Manual
Maintenance instruction for the WB valves
Steps and procedures described in this maintenance instruction are based on a valve which is not
installed in a pipe system.
Before any maintenance begins the valve must be removed from the pipe system and the pneumat-
ic cylinder must be disconnected from the air supply. Follow procedure described in installation and
service instruction for the knife gate valve and its actuator.
Maintenance shall be performed by qualified personal. Qualified are those persons who, due to
experience, can judge the risk and execute the work correctly and who are able to detect and to
eliminate possible risks.
All specifications are subject to change without notice.
This instruction is a step-by-step instruction for maintenance on Stafsjö’s knife gate valves WB, WB 11, WB12 and
WB14.
Following procedures are described in this service instruction:
A. Disassemble parts of the valve.
B. Changing box packing, sealing profile and gate.
C. Torque for gland nuts.
D. Installation of stem and stem nut on hand wheel operated valves.
E. Installation of hand wheel and double acting pneumatic cylinder.
For information on installation procedures and other technical documents,
please see documents available on www.stafsjo.com.
Stafsjö does not accept any responsibility for the product if maintenance on
the knife gate valve is not performed according to this instruction. Neither
does Stafsjö accept any responsibility for the product if it has been mod-
ified from its original condition.
Spare parts
Spare parts may differ depending on valve size and date of manufacturing. Each knife gate valve is identified with a label
containing the article number and serial number. When corresponding with Stafsjö or your local representative, please
have these numbers available. Stafsjö recommends the customer to keep one set of spare parts on stock parts for each
valve type and size.
Spare parts can be ordered from Stafsjö or your local representative. Stafsjö also offers maintenance service of the
valve, either on site at the customer’s plant or at Stafsjö’s workshop. Please contact Stafsjö or your local representative
for further information.
Safety warnings at maintenance
Document: mi-WB, 2013-11-05, issue: 5
Nut and washer
Valve body
Sealing profile
Gate
Stud bolt
Gland
Box packing
Pin, long
Pin, short
Sealing profile
Flange sealing
Sealing profile
Figure 1: Main components
Nut and washer
Valve body
Box packing
Sealing profile
Flange sealing
Gland
Stud bolt
Gate
Sealing profile
Sealing profile
Pin, long
Pin, short
Maintenance instruction
WB
2
Figure 2: part list
Pos
Part
Pos
Part 1 Hand Wheel
8a
Pinn bolt
1d
Washer
8b
Washer
1e
Nut
8c
Nut 2 Yoke
9*
Boxpackning with a box bottom scraper > DN 200
2a
Bearing
10
Valve body
2b
Slide Washer
10c*
Flange sealing
2c
Bearing
13*
Sealing profile
3
Stem
13a*
Pin, long
4
Stem Nut
13b*
Pin, short
4a
Washer
16
Gate guard, not for HW
4b
Bolt
18
Cylinder
6
Gate
20
Bolt/Clevis pin
7
Beam
21
Locking pins
7c
Bolt
20a
Washer
7d
Washer
20b
Nut
7e
Washer
25
Piston rod
7f
Nut
28
Locking nut
7g
Bolt
* Recommended spare parts.
8
Gland
EC pneumatic actuator
AC pneumatic actuator
WB equipped with sealing
profile and separate pins
WB 11, WB14, WB 11k and WB 12 equipped with one
piece molded sealing profile (U-shaped)
Maintenance instruction
WB
3
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