Replacing Packing - Emerson Fisher ET Instruction Manual

ET Valve
November 2017
For valves with HIGH‐SEAL packing, see the Fisher instruction manual, HIGH‐SEAL Live‐Loaded Packing System, D101453X012, for
packing instructions.
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 (key 8) maintains a sealing force on the packing. If leakage is
noted around the packing follower (key 13), check to be sure the shoulder on the packing follower is touching the
bonnet. If the shoulder is not touching the bonnet, tighten the packing flange nuts (key 5, figure 14) until the shoulder
is against the bonnet. If leakage cannot be stopped in this manner, proceed to the Replacing Packing procedure.
Figure 2. Lubricator and Lubricator/Isolating Valve (Optional)
10A9421‐A
AJ5428‐D
A0832‐2
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, the valve stem may be 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, the leakage
may be 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.

Replacing Packing

WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve, 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,
and 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. Disconnect the operating lines from the actuator and any leak‐off piping from the bonnet. Disconnect the stem
connector, then remove the actuator from the valve by unscrewing the yoke locknut (key 15, figure 14) or the hex
nuts (key 26, figure 14).
6
LUBRICATOR
LUBRICATOR/ISOLATING VALVE
Instruction Manual
D100398X012