1. Valtek MK1 Rebuild
PSA Valve Rebuild in pictures
3” valve with Kalrez packing, soft seat
and PTFE seat and bonnet gaskets

2. Valtek MK1 Control Valve
• Valtek valve mounted
in vise for rebuild.
Spray all fasteners
and mating pieces
with Kroil for ease of
removal.

3. Preparing for Rebuild
• Center punch valve
components for
removal so that they
go back the way they
were taken apart.

4. Removing stored energy
• The actuator spring’s
stored energy must
be removed. This is
accomplished by
removing the bolt on
top of the actuator.

5. Actuator Bolting
• Begin disassembly of
actuator from valve
body by removing
fasteners from
packing follower and
actuator clamp.

6. Removing the Actuator Clamp
• A punch or wedge
may be required to
knock loose the
actuator clamp.

7. Actuator Tubing Removal
• Disassemble tubing
from actuator and
positioner and set
aside.

8. Separating plug from Actuator on a
Fail Closed Valtek Valve
• Apply a little air to the
bottom of the actuator
to lift the plug off the
seat.

9. Unthreading Plug/Stem
• Loosen the stem
clamp and locknut
and unthread the
valve plug/stem while
lifted off the seat. This
prevents damage to
the seating surfaces
of the plug and seat.

10. Removing Stem Locknut
• The locknut on the
stem must be
removed before the
packing follower can
be removed. Apply
enough air to actuator
to remove locknut
being careful nut to
place fingers in a
position to pinch.

11. Actuator removal
• After removing the
packing follower, the
actuator is free to be
removed.

12. Actuator
• Place actuator in
another vise or set
aside to work on after
valve body rebuild is
complete. Place all
removed components
on workbench for
clean up and ease of
reassembly.

13. Loosening Bonnet Nuts
• Using an impact gun
or combination
wrench, loosen nuts
on bonnet for
removal.

14. Removing Bonnet Assembly
• With bonnet nuts
removed, lift off the
bonnet retainer collar
and set aside. Pull
bonnet assembly from
valve body and set on
workbench. Seat
retainer can now be
removed.

15. Seat Retainer
• The word “UP” is
casted into the seat
retainer. Make sure
that during
reassembly the
retainer is in the
correct position.

16. 3 Piece Soft Seat, Seat Ring
• Remove seat ring
from valve body. This
may require the use
of a bearing puller
inserted under the
seat to assist in its
removal.

17. 3 Piece Seat Ring

18. Valve Bonnet
• Bead blast the valve
bonnet being careful
to not bead blast the
packing cavity. Apply
some paint to the
exterior of the valve
bonnet and clean the
packing area.

19. Valve Components for Rebuild
• Laying out all restored
and new valve
components speeds
the rebuild process
and provides an
orderly rebuild along
with a neat work area.

20. Kalrez Packing Rings
• Apply a little bit of
Krytox to the Kalrez
chevron packing
rings. Use nitrile
gloves when handling
Krytox.

21. Stem Cleaning
• Clean off stem
residue and polish
stem with diamond
polish with stem in
lathe using a cloth.

22. Body Reassembly
Seat Ring, Seat
Retainer,
Plug/Stem and
Bonnet
reinstalled. Don’t
forget the Bonnet
Gasket!

23. Valve Repack
• Repack valve, install
bonnet flange and
loosely install bonnet
nuts. Do not tighten
bonnet nuts at this
time.

24. Actuator Repair
• With the actuator
stored energy
removed by removing
the bolt on top of the
actuator, remove the
lock ring at the base
of the actuator.

25. Actuator Top Removed
• Actuator without the
actuator top in place.
Note the position of
the spring, spring
retainer and piston
spacer.

26. Actuator Top
• Before and after
pictures of actuator
top. Check inside
finish with finger tips
to make sure there
are no obstructions
that may damage new
piston o-ring. Replace
with a new top if there
are deep wear points.

27. Actuator Base and Yoke
• Note O-Ring residue
on actuator base and
condition of actuator
stem o-ring and guide
bushings.

28. Actuator Reassembly
• Replace all O-Rings
and lube with o-ring
lubricant.
Reassemble actuator
components.

29. Finishing Actuator Rebuild
• Reinstall actuator lock
ring at base of
actuator. Lube
actuator bolt and
reinstall bolt being
careful to line up
spring retainer hole
on the spring retainer
plate.

30. Actuator Reinstalled
• Reinstall actuator on
valve. Placing
actuator over stem,
place packing follower
over stem, thread on
stem locknut. Orient
actuator shaft with
slits toward yokes so
stem clamp will work
properly.

31. Complete
• Calibrate positoner,
and feedback sensor.
Check stroke during
calibration.