Replacing Packing - Fisher EZ easy-e Instruction Manual

Instruction Manual
D100401X012
Figure 8. Typical ENVIRO‐SEAL Packing System with
Graphite ULF Packing
STUD
(KEY 200)
HEX NUT
(KEY 212)
PACKING
FLANGE
(KEY 201)
PACKING
RING
(KEY 209)
PACKING
RING
(KEY 210)
PACKING
BOX RING
(KEY 211)
39B4612/A

Replacing Packing

WARNING
Observe the warning at the start of the Maintenance section.
This section covers replacing packing used in plain and extension bonnets. PTFE V‐ring packing is shown in figure 3,
PTFE/composition packing is shown in figure 4, and graphite/ribbon packing is shown in figure 5.
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, 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 and then remove the actuator from the valve by unscrewing the yoke locknut (key 15, figure 11).
WARNING
To avoid personal injury or property damage caused by uncontrolled movement of the bonnet, loosen the bonnet by
following the instructions in the next step. Do not remove a stuck bonnet by pulling on it with equipment that can stretch
or store energy in any other manner. The sudden release of stored energy can cause uncontrolled movement of the bonnet.
If the seat ring retainer sticks to the bonnet, proceed carefully with bonnet removal.
Note
The following step also provides additional assurance that the valve body fluid pressure has been relieved.
Figure 9. Typical ENVIRO‐SEAL Packing System with
Duplex Packing
200
212
SPRING
PACK
ASSEMBLY
201
(KEY 217)
GUIDE
BUSHING
(KEY 207)
PACKING
215
WASHERS
(KEY 214)
216
GUIDE
207
BUSHING
(KEY 208)
209
211
24B9310
A6722/IL
EZ Valve
November 2017
213
217
207
207
214
207
9