Packing Maintenance; Stopping Leakage; Packing Replacement; Disassembly - Fisher V150 Instruction Manual

Use bypass valves or completely
shut off the process to isolate the valve
from process pressure. Relieve process
pressure on both sides of the valve.
Drain the process media from both
sides of the valve.
Vent the power actuator loading
pressure.
Use lock-out procedures to be sure
that the above measures stay in effect
while you work on the equipment.

Packing Maintenance

Key numbers are shown in figure 9, unless otherwise
indicated. A detailed view of the packing is also shown
in figure 3.
If the valve is equipped with the ENVIRO-SEAL Pack-
ing System, refer to the separate ENVIRO-SEAL
Packing System for V-Line and edisc Rotary Valves
instruction manual.
For the ENVIRO-SEAL Packing System,
refer to the Parts List section for individ-
ual parts (see figure 3). Refer to the sep-
arate ENVIRO-SEAL Packing System for
V-Line and edisc Rotary Valves instruc-
tion manual for maintenance instruc-
tions.

Stopping Leakage

For PTFE V-ring packing, leakage around the packing
follower and packing flange (keys 17 and 40) can be
stopped by tightening the packing follower nuts (key
20).
If the packing is relatively new and tight on the drive
shaft (key 6), and if tightening the packing follower
nuts does not stop leakage, it is possible that the drive
shaft is worn or nicked so that a seal cannot be made.
If the leakage comes from the outside diameter of the
packing, it is possible that the leakage is caused by
nicks, scratches, or corrosion on the packing box wall.
If the leakage cannot be stopped by the above steps,
the packing must be removed and replaced. Inspect
the drive shaft and packing box before installing new
packing parts.

Packing Replacement

When replacing the packing, it is not recommended
that the actuator be removed from the valve while the
valve is still in the pipeline or between flanges. Valve/
14 through 20-Inch Design V150 and V300
Note
actuator adjustments must be made with the valve out
of the pipeline.

Disassembly

1. Isolate the control valve from the line pressure, re-
lease pressure from both sides of the valve, and drain
the process media from both sides of the valve. If us-
ing a power actuator, shut off all pressure lines to the
power actuator, release pressure from the actuator,
and disconnect the pressure lines from the actuator.
Use lock-out procedures to be sure that the above
measures stay in effect while you work on the equip-
ment.
2. Remove line bolting, remove the control valve from
the pipeline, and place the actuator/valve assembly on
a protected flat surface with the seal protector ring fac-
ing up.
3. Remove the actuator cover. Note the orientation of
the actuator with respect to the valve body and the
lever orientation with respect to the valve drive shaft
(see figure 7).
WARNING
When the actuator is removed from the
valve, the V-notch ball/shaft assembly
may suddenly rotate, resulting in per-
sonal injury. To avoid injury, carefully
rotate the V-notch ball to the stable
position after the actuator is removed.
CAUTION
When removing the actuator from the
valve, do not use a hammer or similar
tool to drive the lever or actuator off the
valve shaft. Driving the lever or actuator
off the valve shaft could damage the
V-notch ball, seal, and valve.
If necessary, use a wheel puller to re-
move 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 damage the
V-notch ball, seal, and valve.
Some actuator designs have a bolt in-
serted in the lever to spread the clamp
on the valve spline shaft. Tightening the
bolt expands the splined lever connec-
tion allowing the valve shaft to be re-
moved.
Note
5