EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
8
The proper bolting procedures in step
14 include, but are not limited to,
ensuring that bolting threads are clean
and evenly tightening the cap screws
or nuts onto the studs in a crisscross
pattern. Tightening one cap screw or
nut may loosen an adjacent cap screw
or nut. Repeat the crisscross
tightening pattern several times until
each cap screw or nut is tight and the
body-to-bonnet seal is made.
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.
Design 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.