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Stafsjö HL Maintenance Instruction

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Document: Maintenance instruction
Product: HL/HG/HP/HPT/HX
Issue: 4
Issue date: 2017-02-27
Maintenance instruction
This maintenance instruction is a step-by-step instruction for service and maintenance on
Stafsjö's knife gate valves HL, HG, HP, HPT and HX. The instruction shall be available for
persons responsible for service and maintenance on Stafsjö's
knife gate valves. The following procedures are described:
A – Change of seat
B – Change of box packing
C – Change of box packing when the valve is installed in a
system
D – Torque for gland nuts
E – Torque for valve body screw joint reinforcement
F – Change from hand wheel (HW) to pneumatic cylinder
G – Change of gate and guide strips
H – ATEX, change of spring
For more detailed information on technical data of valves, actuators or
accessories, please see data sheets on www.stafsjo.com, or contact Stafsjö
or your local representative.
Each knife gate valve is identified with a label containing the article number and serial
number. When in contact with Stafsjö or your local representative, please have these
numbers available.
Stafsjö Valves AB does not accept any responsibility for the product if service and
maintenance on the knife gate valve is not performed according to this instruction. Nor does
Stafsjö Valves AB accept any responsibility of the product if any significant change has
been done to the product.
Spare parts
Recommended spare parts are described in spare part data sheets for each knife gate
valve type 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 Stafsjö or your local representative. Spare part data
sheets and addresses are available on www.stafsjo.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 is commenced.
All gate guards must be installed after finished maintenance on the knife gate valve.
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
All specifications subject to change without notice.
A Bröer Group company

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Summary of Contents for Stafsjö HL

  • Page 1 Maintenance instruction This maintenance instruction is a step-by-step instruction for service and maintenance on Stafsjö’s knife gate valves HL, HG, HP, HPT and HX. The instruction shall be available for persons responsible for service and maintenance on Stafsjö’s knife gate valves. The following procedures are described: A –...
  • Page 2 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 Main components in the Stafsjö knife gate valve HL/HG/HP/HPT/HX Figure 1 Main components...
  • Page 3 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 Part list of the Stafsjö knife gate HX Figure 2 Part list of HX, numbering also applies to HL/HG/HP/HPT valves in similar manner Part list Part Part Part Part Hand wheel...
  • Page 4 Issue date: 2017-02-27 Service and maintenance See figure 1-2 for identification of parts on the valves HL, HG, HP, HPT and HX valve. Parts differ depending on the valve size. Please contact Stafsjö Valves AB or your local representative if you have any questions.
  • Page 5 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 Figure 3 Seat and O-rings...
  • Page 6 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 B – Change of box packing Place the valve upright in for example a screw vice to simplify changing the gate and box packing. Large valves shall be placed on a horizontal work bench.
  • Page 7 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 15. The gland (8) must also be in line with the gate (6) with the same distance between the gland and the gate all around. Check that there is no metal contact between the gland (8) and the gate (6).
  • Page 8 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 other. It is important to push the first braid evenly into the bottom of the box. The joint of next braid must be placed on the opposite long side of the joint of the previous braid.
  • Page 9 (8) and the gate (6). Figure 4 Crosswise tightening of nuts. E – Torque for HL/HG/HP/HPT/HX valve body screw joint reinforcement The torque T in the tables below is a recommended value for tightening the screw joint reinforcement between the two HL/HG/HP/HPT/HX valve body sides.
  • Page 10 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 Screw joint Torque Torque knife gate reinforcement lbf x ft F – Change from hand wheel (HW) to pneumatic cylinder To be able to adjust the cylinder stroke, the pneumatic cylinder must be installed on the knife gate valve when the valve is not installed in a system.
  • Page 11 The valve body sides do not require to be divided when only changing the gate. The body gasket in the knife gate valve HL, HG, HP, HPT and HX differs depending on the valve size and date of manufacture. Please contact Stafsjö Valves AB or your local representative if you have any questions.
  • Page 12 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 Graphite tape body gasket Remove the actuator (1/18) and box packing (9), see chapter B. Remove the retainer ring (12) and seat (13), see chapter A. Remove the gate (6) and check it for damages such as dents and scrapes. If the gate is damaged it can wear out the box packing (9) and the seat (13), causing leakage.
  • Page 13 Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 14. Place the gate (6) on the valve body side. Check that the gate clevis hole is placed towards the valve top and actuator. 15. Assemble the other components in reversed order, see step 1-2.

  • Page 14: Parts List

    Document: Maintenance instruction Product: HL/HG/HP/HPT/HX Issue: 4 Issue date: 2017-02-27 Figure 5 Parts list for an ATEX valve Parts list Part Part Stud bolt Screw Washer Spring Spring holder Earth cable Spring holder...

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