Flowserve TSQVIOM Durco Mach 1 Severe Service Valve IOM - Manual (Page 8)

8
SECTION IV TSQV VALVE DISASSEMBLY
Recommended Precautionary Measures
1. Valves must be relieved of process fluid and
pressure prior to disassembly. Plug should be in
the open position.
2. Personnel performing disassembly must be
suitably protected and alert for emission of
hazardous process fluid.
3. If there is a pipe plug located at the bottom
bowl of the valve, DO NOT remove the pipe plug
until the valve plug has been removed.
Disassembly Steps
NOTE: Refer to Figures 1-3 for parts
identification. If an actuator or gearbox
operates the valve, alignment marks should
be noted to assure correct orientation when
reassembled. This may best be
accomplished by making matching marks
on the plug stem and operator housing with
no burrs on the plug stem permitted.
1. Gradually loosen plug adjuster fasteners
(Part 12)-DO NOT REMOVE.
2. Turn plug (Part 2) in order to raise the
plug to vent any material trapped in the
valve (see note below). NOTE: If there is
no upward movement of the plug (Part 2),
it will be necessary to devise a method of
lifting the plug upward. This may require
removal of the valve operator (Step 3).
This operation should be undertaken
noting the above precautionary measures.
Methods of plug removal must include
protective measures on plug stem and
plug end.
3. WARNING: Do not loosen or remove top
cap fasteners (Part 10) when removing an
operator or accessory. Remove the
operator by unfastening it from the
bracket.
4. Once the plug (Part 2) has lifted, the
adjuster fasteners (Part 12) can be
completely removed.
5. Loosen and remove the packing adjuster
fasteners (Part 8).
6. Gradually loosen but DO NOT REMOVE
all of the top cap fasteners (Part 10). Turn
the plug until it is loose from the sleeve
(Part 3) and all pressure has been vented.
(Again, it may be necessary to use a
mechanical means to move the plug
upwards.)
7. Remove the top cap fasteners (Part 10)
and top cap (Part 9).
8. Remove the plug (Part 2) from the body
(Part 1).
9. Remove the grounding spring (Part 16)
from the plug.
10. lnspect the valve sleeve (Part 3) for
wear or damage, especially scratches
near the top, bottom, and port areas. If
wear or damage is excessive, the sleeve
should be replaced.
11. Remove sleeve (Part 3) as follows:
NOTE: Care should be taken not to
damage the internal body bore.
To remove the sleeve, use a wooden
dowel and pry the sleeve upward by
engaging the dowel in the sleeve at the
top of the port. A sharp blow may be
necessary to unseat the sleeve. Both
sides may need to be pried upward for
removal. (See Figure 4)
12. Thoroughly clean all valve parts with an
acceptable cleaner.
13. lnspect parts for damage. Look for
marred, scratched, or rough sealing
surfaces on the valve plug (Part 2).
NOTE: Reinstallation of damaged or
unclean parts will ruin any replacement
seals installed into the valve.
Figure 4