EZ-C, ET-C, and EWT-C Valves
Instruction Manual
Form 5376
August 2006
7
Table 3. Recommended Torque for Packing Flange Nuts
VALVE STEM DIAMETER
CLASS
GRAPHITE PACKING
PTFE PACKING
Minimum Torque
Maximum Torque
Minimum Torque
Maximum Torque
mm
Inch
N
S
m
Lbf-in
N
S
m
Lbf-in
N
S
m
Lbf-in
N
S
m
Lbf-in
9.5
3/8
150
3
27
5
40
1
13
2
19
300
4
36
6
53
2
17
3
26
600
6
49
8
73
3
23
4
35
12.7
1/2
150
5
44
8
66
2
21
4
31
300
7
59
10
88
3
28
5
42
600
9
81
14
122
4
39
7
58
19.1
3/4
150
11
99
17
149
5
47
8
70
300
15
133
23
199
7
64
11
95
600
21
182
31
274
10
87
15
131
25.4
1
150
19
169
29
254
9
80
14
120
300
26
226
38
339
12
108
18
162
600
35
310
53
466
17
149
25
223
31.8
1-1/4
150
27
238
40
357
13
113
19
169
300
36
318
54
477
17
152
26
228
600
49
437
74
655
24
209
36
314
Table 4. Body-to-Bonnet Torque Guidelines
VALVE SIZE, INCHES
BOLT TORQUES
(1)
Bolt Material
B8M
(2)
or
S20910 (XM-19)
(3)
N
S
m
Lbf-ft
1
122
90
1.5 or 2
91
67
3
163
120
4, 6X4, or 8X4
258
190
6, 8X6, or 12X6
522
385
8 or 10X8
712
525
1. Determined from laboratory testing.
2. SA193-B8M strain hardened.
3. Hot rolled.
7.
For Design EZ-C valves,
remove the stem
locknut. Separate the valve plug and stem from the
bonnet, and set the parts on a protective surface to
prevent damage to gasket or seating surfaces.
8.
For Designs ET-C and EWT-C:
If it is necessary
to remove and inspect the valve trim, refer to the
following Trim Maintenance section.
9. Remove the bonnet gasket (key 10) and cover
the opening in the valve to protect the gasket
surface and prevent foreign material from getting
into the valve body cavity.
10. Remove the packing flange nuts, packing
flange, upper wiper, and packing follower
(keys 5, 3, 12, and 13). Carefully push out all the
remaining packing parts from the valve side of the
bonnet using a rounded rod or other tool that will not
scratch the packing box wall. Clean the packing box
and metal packing parts.
11. Inspect the valve stem threads and packing box
surfaces for any sharp edges which might cut the
packing. Scratches or burrs in the packing box
surfaces could cause leakage or damage to the new
packing. If the surface condition cannot be improved
by light sanding, replace the damaged parts.
12. If necessary, go to the Trim Maintenance
procedures to remove, inspect or replace trim parts.
Return to this section when installing the bonnet on
the valve body.
Installing the Bonnet
13. Remove the covering protecting the valve body
cavity and install a new bonnet gasket (key 10),
making sure the gasket seating surfaces are clean
and smooth. Then slide the bonnet over the stem
and onto the stud bolts (key 15).
Note
Proper performance of the bolting
procedures in step 10 compresses the
spiral wound gasket (key 12) or load
ring (key 26) to both load and seal the
seat ring gasket (key 13). It also
compresses the outer edge of the
bonnet gasket (key 10) to seal the
body-to-bonnet joint.