Instruction Manual

Instruction Manual
D103545X012
Control-Disk NPS 14-36
April 2011
17
If necessary, use a wheel puller to remove the lever or actuator from the valve shaft. It is okay to tap the wheel puller screw
lightly to loosen the lever or actuator, but hitting the screw with excessive force could also damage internal valve parts.
Key numbers in this procedure are shown in figure 9 unless otherwise indicated.
1. Remove the valve from the pipeline. Remove the actuator from the valve.
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 10.
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.