Packing Maintenance - Emerson Fisher HS Instruction Manual

HS Valve
June 2019
lubricator, simply turn the cap screw clockwise to force the lubricant into the packing box. The lubricator/isolating
valve operates the same way except the isolating valve must first be opened and then closed after lubrication is
completed.
Figure 3. Lubricator and Lubricator/Isolating Valve
10A9421-A
AJ5428-D
A0832-2/IL

Packing Maintenance

Note
If the valve has ENVIRO‐SEAL live‐loaded packing installed see the Fisher instruction manual entitled ENVIRO‐SEAL Packing System
for Sliding‐Stem Valves (D101642X012) for packing instructions.
If the valve has HIGH‐SEAL heavy‐duty live‐loaded packing installed, see Fisher instruction manual entitled HIGH‐SEAL Live‐Loaded
Packing System (D101453X012) for packing instructions.
Installation of graphite ribbon packing requires special care to avoid trapping air between the rings. Start with only one
ring at a time without forcing the top of the packing ring below the bottom of the entrance chamfer of the packing
box. Thus, when a ring is added, the stack should not be pushed into the cavity more than the thickness of the added
ring. Key numbers refer to figure 3 for PTFE V-ring packing and to figure 4 for PTFE/composition packing, unless
otherwise indicated.
For spring-loaded single PTFE V-ring packing, the spring maintains a sealing force on the packing. If leakage is noted
around the packing follower, check to be sure the shoulder on the packing follower is touching the bonnet. If the
shoulder is touching the bonnet, tighten the packing flange nuts until the shoulder is provided for PTFE/composition
or other packings that require lubrication, it will be installed in place of the pipe plug until the shoulder is against the
bonnet. If leakage cannot be stopped in this manner, proceed to the replacing packing procedure.
If there is undesirable packing leakage with other than spring-loaded packing, first try to limit the leakage and
establish a stem seal by tightening the packing flange nuts. If the packing is relatively new and tight on the stem, and if
tightening the packing flange nuts does not stop the leakage, it is possible that the valve stem is worn or nicked so that
a seal cannot be made. The surface finish of a new valve stem is critical for making a good packing seal. If the leakage
comes from the outside diameter of the packing, it is possible that the leakage is caused by nicks or scratches around
the packing box wall. If performing any of the following procedures, inspect the valve stem and packing box wall for
nicks and scratches.
4
LUBRICATOR
LUBRICATOR/ISOLATING VALVE
Instruction Manual
D100381X012