Packing Maintenance; Replacing Packing - Emerson Fisher SS-264 Instruction Manual

SS-264 Valve
September 2021
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D The valve packing area may contain process fluids that are pressurized. Process fluids may spray out under pressure
when removing the packing hardware or packing rings.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.

Packing Maintenance

Key numbers in this procedure are shown in figures 15 and 18 unless otherwise noted. A detailed view of the packing is
also shown in figure 4.
Refer to the Parts List section of this manual for individual parts.
If the packing is relatively new and tight on the drive shaft (key 8), and if tightening the packing nuts (key 16) 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 or scratches on the packing
box wall. Inspect the drive shaft and packing box wall for nicks or scratches while performing the following procedure.

Replacing Packing

The open and closed travel stops of the actuator do not require adjustment unless the bonnet­to­body joint is
loosened. If the actuator is removed for packing replacement, simply remount the actuator per the Actuator Mounting
section of this manual.
Disassembly
WARNING
Observe the steps in the WARNING at the beginning of the Maintenance section.
1. Remove the actuator from the bonnet by removing the eight cap screws (key 18).
2. Remove the yoke key (key 103), coupler (key 102), and square key (key 15) from the drive shaft.
3. Loosen and remove packing nuts (key 16), packing flange (key 5), Belleville springs (key 6A), and the stop flange
(key 6C).
Note
Do not loosen or adjust the stop cap screws (keys 22 or 24) on the packing flange (key 5) or the stop flange (key 6C).
WARNING
Personal injury could result from packing leakage. Do not scratch the drive shaft or packing box wall while removing
packing parts in the following procedure.
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Instruction Manual
D103565X012