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D. Pinning the Plug-Stem Assembly
1.
plug (B005) diameter and plug stem (B008) diameter (
see
Figure 2
). Apply a small amount of grease on the pin and
2.
hammer while the plug is held is a vise. (see Figure 2).
3.
placed in a lathe to ensure it is concentric with the stem.
mallet.
5.4.2 Replacing Existing Stem Only
A. Removing Existing Pin and Stem
1.
to drive out the old plug stem pin (B007).
Note: If it is necessary to drill out the pin, use a drill
bit slightly smaller than the pin diameter.
2. Hold the plug (B005) in a vise (Follow previous CAUTION
alerts to protect parts).
3. Lock one nut against another at the end of the plug stem
(B008). Using a wrench on the lower nut, unscrew the stem
counter-clockwise.
B. Screwing Stem to Plug
C. Drilling the New Stem
as a guide).
D. Pinning
previous section, taking care not to damage the plug guide
area.
5.5 Packing Box
packing flange nuts (B028) against the packing flange (B014). Care
operation of the valve. If all compression is used up and the valve
leaks, then new packing is required.
CAUTION
CAUTION
WARNING
DANGER
Valve must be isolated and the pressure vented be-
fore performing packing box maintenance.
5.5.1 Braided PTFE with Carbon or Aramid Core (Standard)
Note: The Braided PTFE/Carbon or Aramid packing rings
have a skive cut allowing packing replacement without
disconnecting the plug stem from the actuator connector or
actuator stem.
A. Loosen and remove packing flange nuts (B028).
B. Lift the packing flange (B014) and packing follower (B030) up
the valve stem.
Note: They may be taped in place to keep them out of
the way before proceeding.
C. By means of a hooked instrument, remove packing rings
(B011) ensuring not to damage the sealing surfaces of the
Note: On valves equipped with an optional lubricator
connection, the lantern ring must also be removed to
gain access to lower packing rings.
D. Replace packing rings (B011).
Note: Assemble and compress rings one at a time into
packing box. The skive cut of each packing ring must be
placed about 120 degrees apart.
Note: On valves equipped with an optional lubricator
connection, see Figure 4 for correct amount of rings to
place under the lantern ring .
E. Replace packing follower (B030) and packing flange (B014).
F. Replace and tighten packing stud nuts (B028).
CAUTION
CAUTION
WARNING
DANGER
Do not over tighten.
G.
necessary to stop external leakage.
Note: In an emergency, string packing may be used as
a temporary repair only. It must be replaced with the
correct packing as soon as possible.
5.5.2 Flexible Graphite Rings
Note: Flexible graphite packing rings replacement may require
disconnecting the plug stem from the actuator stem and removal
of the actuator if rings are not skive cut.
A. Loosen and remove packing flange nuts (B028).
B. Remove packing flange (B014) and packing follower (B030)
from the plug stem.
C. By means of a hooked instrument, remove packing (B011)
ensuring not to damage the sealing surfaces of the packing
Note: On valves equipped with an optional lubricator
connection, the lantern ring must also be removed to
gain access to lower packing rings.
D.
ring (Graphite Filament Yarn braided ring),
graphite rings (smooth rings),
Note: Assemble and compress rings one at a time into
packing box.
Note: On valves equipped with an optional lubricator
connection, see Figure 4 for correct arrangement
according to valve size.
E.
F.