Disassembly - Fisher V150 Instruction Manual

14 through 20-Inch Design V150 and V300
37A6528-A
A3143-2/IL
VIEW A-A
Figure 4. Optional Shaft-to-Body Bonding Strap Assembly
During disassembly and re-assembly procedures, han-
dle the seal protector ring, seal, and other parts (keys
3, 11, 13, and 37) carefully to prevent damage. A new
gasket (key 15) is required whenever the seal protec-
tor ring (key 3) is removed.
The flow ring construction does not use a seal (key
11), radial seal (key 37), or wave spring (key 13). Use
this procedure to remove the seal protector ring for
flow ring constructions, but disregard any instructions
calling for the seal and other seal parts.

Disassembly

WARNING
If 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. If
necessary, lock the V-notch ball in a
specific position when directed by the
following steps.
8
ACTUATOR
VALVE BODY
A
A
Key numbers are shown in figure 9, unless otherwise
indicated.
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, also shut off all pressure lines to
the power actuator and release all pressure from the
actuator.
2. Remove line bolting, remove the control valve/ac-
tuator assembly from the pipeline, and place the valve
on a protected flat surface with the seal protector ring
facing up. Carefully rotate the V-notch ball to the open
position.
Lifting bolt holes are provided in the
seal retainer or flow ring to assist in its
removal from the valve body.
3. Remove the retainer screws (key 21). Carefully
remove the seal protector ring and gasket (keys 3 and
15). (For flow ring constructions, go to step 4.)
a. For valves with composition seal, remove the
seal (key 11) from the valve body (key 1).
b. For valves with HD metal seal, once the pro-
tector ring has been removed from the valve, push
the metal seal (key 11) out of the seal protector ring
(key 3). Remove the radial seal (key 37). Inspect,
clean, or obtain replacement parts as necessary.
It might be necessary to remove the HD metal seal by
carefully tapping it with a soft punch and hammer.
Take care not to damage the seal protector ring sur-
faces.
4. Inspect, clean, or obtain replacement parts as nec-
essary. Inspect the gasket and sealing surfaces on the
valve body (key 1), V-notch ball (key 2), ball seal (key
11), and seal protector ring (key 3) for damage.
5. If a replacement V-notch ball, drive and follower
shafts, or bearings (keys 2, 6, 9, and 10) are needed,
proceed to the Bearing and V-notch Ball Maintenance
procedure for disassembly and assembly procedures.
If only the seal is to be replaced, proceed to the as-
sembly procedure below.
Note