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Stafsjö SLV Maintenance Instructions Manual

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Document: Maintenance instruction
Product: SLV, SLF, SLH, SLX
Issue: 3
Issue date: 20150227
Maintenance instruction for SLV, SLF, SLH and SLX
This maintenance instruction is a step-by-step instruction for service and
maintenance on Stafsjö's knife gate valve SLV, SLF, SLH and SLX.
Following procedures are described in this service instruction:
A. Change of seat
B. Change of gate and box packing
C. Change of box packing when the valve is installed in a system
D. Torque for nuts on gland
E. Change from hand wheel (HW) to pneumatic cylinder (EC) when
the valve is installed in a system
For procedures A and B the knife gate valve must be uninstalled from the system.
For information on installation and operation procedures or detailed technical data, please see documents
available on www.stafsjo.com
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 does not accept any responsibility for the product if service and 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 modified from its original condition.
Spare parts
Recommended spare parts are described in spare part data sheets for each knife gate valve typ on
www.stafsjo.com. Stafsjö recommends the customer to keep one set of spare parts for each valve type
and size in store.
Spare parts can be ordered from Stafsö or your local representative. Spare part data sheets and ad-
dresses are available on www.stafso.com

Safety information

No work is allowed on the knife gate valve when the system is pressurised or the actuator is
connected. The system must be free from pressure and empty. Actuator and accessories must
be disconnected before any work begins.
All gate guards must be installed on the valve after maintenance.
Information is only for informational purpose. All specifications are subject to change without notice.
.

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Summary of Contents for Stafsjö SLV

  • Page 1: Safety Information

    Maintenance instruction for SLV, SLF, SLH and SLX This maintenance instruction is a step-by-step instruction for service and maintenance on Stafsjö’s knife gate valve SLV, SLF, SLH and SLX. Following procedures are described in this service instruction: A. Change of seat B.
  • Page 2 Document: Maintenance instruction Product: SLV, SLF, SLH, SLX Issue: 2 Issue date: 2012-11-05 Main components of Stafsjö’s SLV, SLF, SLH and SLX Gate Stud bolt Nut and washer Gland Scraper Box packing Seat Valve body...
  • Page 3 Document: Maintenance instruction Product: SLV, SLF, SLH, SLX Issue: 2 Issue date: 2012-11-05 Part list of Stafsjö’s SLV, SLF, SLH and SLX (Figure 2) Pos. Detail Pos. Detail Pos. Detail Pos. Detail 10/a/b Valve bodyd Hand wheel Plug Yoke Gate...
  • Page 4 Document: Maintenance instruction Product: SLV, SLF, SLH, SLX Issue: 2 Issue date: 2012-11-05 A. Change of seat Place the valve horizontally for simple change of seats. Open the valve. Remove the seat (13). Check the gate (6) for damages such as dents and scratches. If the gate is damaged it can wear out the box packing (9) and the seat (13), which could cause leakage.
  • Page 5 Document: Maintenance instruction Product: SLV, SLF, SLH, SLX Issue: 2 Issue date: 2012-11-05 12. Place the box bottom scraper (9a) in the bottom of the gland box. Install the first braid (9) on one of the long sides of the gate (6). Use a blunt tool in plastic or wood and a hammer to push the braid into the box.
  • Page 6 Document: Maintenance instruction Product: SLV, SLF, SLH, SLX Issue: 2 Issue date: 2012-11-05 bearing (2a) from the stem (3). Demount the beams (7) and tie rods (5). Loosen the screw (4b) from the stem nut (4) and gate (6). Lift off the stem (3) and stem nut (4).
  • Page 7 Before installing a pneumatic cylinder onto the valve, you must always check: • That the pneumatic cylinder is correct in size regarding the size SLV valve. • That the air supply to the cylinder is correct regarding, quality, pressure and flow.

This manual is also suitable for:

SlfSlxSlh

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