Replacing Valve Plug, Shaft, And Bearings - Emerson Fisher V500 Instruction Manual

Instruction Manual
D100423X012

Replacing Valve Plug, Shaft, and Bearings

Perform this procedure to replace the valve plug (key 2), expansion pin assembly (keys 9 and 10), shaft (key 3), or
bearings (key 6). These parts are independently replaceable; for example, installing a new valve plug does not require
replacing a reusable valve shaft or expansion pin assembly. Key numbers refer to figures 11 and 13 unless otherwise
indicated.
Disassembly of Valve Plug, Shaft, and Bearings
WARNING
To avoid personal injury resulting from contact with edges of the valve plug (key 2) and seat ring (key 4) during plug
rotation, stay clear of the plug edges when rotating the plug. To avoid damage to tools, valve parts, or other items
resulting from valve plug rotation, keep tools and other property away from the edges of the plug.
CAUTION
To avoid increased leakage, increased valve component wear or possible damage to the valve body (key 1), plug (key 2),
shaft (key 3), and bearings (key 6) resulting from a sharp blow to the actuator body or valve parts, use a wheel puller to
separate the actuator parts from the valve shaft.
Do not drive the actuator parts off the valve shaft since this could move the valve bearings, shaft, and plug away from
proper alignment, causing improper seating of the plug. Such misalignment may result in damage to valve components if
the valve is returned to service without disassembly and inspection of the valve plug alignment.
Note
Following removal of the valve from the pipeline and partial disassembly, the valve shaft may be used to remove bearings in
accordance with the procedure described in step 8, below.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Remove the actuator cover. Note the actuator orientation with respect to the valve body and the lever orientation
with respect to the valve drive shaft (see figure 2). Remove the lever but do not loosen the actuator turnbuckle
adjustment. Remove the actuator mounting screws and nuts, and remove the actuator. If necessary, refer to the
actuator instruction manual for assistance.
3. With the valve body (key 1) out of the pipeline, loosen the packing nuts (key 16). If the packing is to be reused, do
not remove it. However, Emerson Automation Solutions recommends that the packing be replaced whenever the
drive shaft is removed.
4. Rotate the plug (key 2) to the fully open position.
V500 Valve
July 2017
15