Emerson Fisher 8532 Instruction Manual page 18

8532 Valve
June 2017
CAUTION
Never use a wrench, pliers, or similar tool to turn the upper shaft. A damaged shaft can cut the packing and allow leakage.
Note
It is not necessary to remove the retaining ring and valve seal when removing the shaft(s) and disk.
WARNING
Avoid personal injury or property damage caused by the impact of a falling or tipping of a large valve. Support large valves
during maintenance.
2. Properly secure the valve on a suitable worktable so it cannot slip, twist, or fall during maintenance.
3. Removing the Anti‐Blowout Design:
a. For PTFE or Graphite Packing: Remove the hex nuts (key 15) and pull off the packing follower (key 11). Remove
the hex jam nuts (key 17) and the anti‐blowout flange (key 10). Remove the anti‐blowout gland (key 12). See
figure 7.
b. For ENVIRO‐SEAL Packing System: Remove the hex nuts (key 101), the packing follower (key 102), jam nuts (key
17), anti‐blowout flange (key 10), and the spring pack assembly (key 103). See figure 11.
4. Remove the packing from around the upper shaft.
5. Remove the tangential pins or disk pins. Locate the pins (key 9) in the upper shaft (key 3) and the pin in the lower
shaft (key 4), if the valve has a two‐piece shaft.
a. If a maintenance kit is available, use the pin extractor to remove the disk pins. Select the correct size pin extractor
tip with screws of proper thread size to match the thread size in the disk pins. If you do not have a kit, see steps c
and d below.
b. Screw the pin extractor tip into the pin as far as possible. With an upward, straight sliding motion, pull out the
pin. Repeat the same procedure for the other pins.
c. You can use a threaded rod with an appropriate spacer (tube) and nut as an extractor tool. If you use a threaded
rod, choose a rod with threads that fit the inside thread of the pins. The rod should extend several inches above
the disk when it is screwed into a pin.
d. After screwing the rod into the pin, slide the spacer over the rod and pin. Thread a nut onto the rod and tighten
it. As you tighten the nut, the nut will drive the spacer against the disk. The increasing force will draw the pin
from the disk.
6. The gasket retainer (key 20) on the side of the valve opposite the upper shaft must be removed before removing
the lower shaft.
Remove the hex head bolts (key 23) and lockwashers (key 22) from the gasket retainer and remove the gasket retainer
and gasket (key 21) to expose the end of the lower shaft.
7. Before removing the lower shaft (key 4), be sure the valve disk is properly supported. Pull the lower shaft from the
valve body. Use a shaft extractor screwed into the puller hole in the end of the lower shaft.
18
Instruction Manual
D101550X012