Stafsjo WB Series Maintenance Instruction

Maintenance instruction for the WB valves
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

 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.
Stafsjö Valves AB. SE-618 95 Stavsjö, Sweden. Tel: +46 11 39 31 00. Fax: +46 11 39 30 67. info@stafsjo.se www.stafsjo.com
.
A Bröer Group Company
Document: mi-WB, 2013-11-05, issue: 5