Instruction Manual
D102175X012
EZ-C, ET-C, and EWT-C Valves
July 2017
10
14. Lubricate the bolting with anti‐seize lubricant and install it, using accepted bolting procedures during tightening,
so that the body‐to‐bonnet joint will withstand test pressures and application service conditions. Use the bolt
torques in table 4 as guidelines.
15. Install new packing and the metal packing box parts according to the appropriate arrangement in figures 2, 3, or 4.
Place a smooth‐edged pipe over the valve stem and gently tap each soft packing part into the packing box.
16. Slide the packing follower, upper wiper, and packing flange (keys 12, 13, and 3) into position. Lubricate the
packing flange studs (key 4) and faces of the packing flange nuts (key 5). Install the packing flange nuts.
17. Tightening packing flange nuts (key 5):
a. For spring‐loaded PTFE V‐ring packing, tighten the packing flange nuts until the shoulder on the packing follower
(key 13) contacts the bonnet.
b. For graphite packing, tighten the packing flange nuts to the maximum
recommended torque shown in table 3.
Then, loosen the packing flange nuts, and retighten them to the recommended minimum
torque shown in
table 3.
c. For double PTFE V‐ring packing, tighten the packing flange nuts alternately in small equal increments until one of
the nuts reaches the minimum recommended torque shown in table 3. Then, tighten the remaining nut until the
packing flange is level and at a 90 degree angle to the valve stem.
d. For ENVIRO‐SEAL live‐loaded packing, refer to the Fisher instruction manual titled: ENVIRO‐SEAL Packing System
for Sliding‐Stem Valves.
18. Mount the actuator on the valve assembly and reconnect the actuator and valve stem according to the procedure
in the appropriate actuator instruction manual.
Trim Maintenance
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
This procedure describes how the valve trim can be completely disassembled. When inspection or repairs are required,
perform only those steps necessary to accomplish the task. Observe the Warning at the start of the Maintenance
section.
Key number locations are shown in figures 8 and 9, unless otherwise noted.
EZ‐C Trim Disassembly
Key number locations are shown in figure 8, unless otherwise noted.
1. Remove the actuator and the bonnet according to steps 1 through 9 of the Replacing Packing procedures in the
Maintenance section.
WARNING
To avoid personal injury due to leaking fluids, avoid damaging gasket sealing surfaces.
The surface finish of the valve stem (key 7) is critical for making a good packing seal.
The seating surfaces of the valve plug (key 2) and seat ring (key 9) are critical for proper shutoff.
Protect these surfaces accordingly.
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