EW Valve
Instruction Manual
Form 2376
March 2007
11
Table 5. Body-to-Bonnet Bolt Torque Guidelines
VALVE SIZE NPS
BOLT TORQUES
(1)
VALVE SIZE, NPS
N
S
m
Lbf
S
ft
4x2
102
75
6x4 or 8x4
259
191
8x6
CL300 or CL600
548
404
8x6
CL900
1315
970
10x8
745
550
12x6
548
404
12x8
CL300 or CL600
732
540
12x8
CL900
2712
2000
1. Determined from laboratory tests.
Table 6. Recommended Torque for Packing Flange Nuts
VALVE STEM
PRESSURE
GRAPHITE TYPE PACKING
PTFE TYPE PACKING
VALVE STEM
DIAMETER
PRESSURE
RATING
Minimum Torque
Maximum Torque
Minimum Torque
Maximum Torque
mm
Inches
RATING
N
S
m
Lbf
S
In
N
S
m
Lbf
S
In
N
S
m
Lbf
S
In
N
S
m
Lbf
S
In
12.7
1/2
CL300
7
59
10
88
3
28
5
42
12.7
1/2
CL600
9
81
14
122
4
39
7
58
19.1
3/4
CL300
15
133
23
199
7
64
11
95
19.1
3/4
CL
600
21
182
31
274
10
87
15
131
25.4
1
CL
300
26
226
38
339
12
108
18
162
25.4
1
CL
600
35
310
53
466
17
149
25
223
31.8
1 1/4
CL
300
36
318
54
477
17
152
26
228
31.8
1-1/4
CL
600
49
437
74
655
24
209
36
314
13. Slide the packing follower, upper wiper, and
packing flange (keys 13, 12, and 3, figure 21) into
position. Lubricate the packing flange studs (key 4,
figure 21) and the faces of the packing flange nuts
(key 5, figure 21). Install the packing flange nuts.
14.
For spring-loaded PTFE V-ring packing
,
tighten the packing flange nuts until the shoulder on
the packing follower (key 13, figure 21) contacts the
bonnet.
For graphite packing,
tighten the packing flange
nuts to the maximum recommended torque shown in
table 6. Then, loosen the packing flange nuts, and
retighten them to the recommended minimum torque
shown in table 6.
For ENVIRO-SEAL or HIGH-SEAL live-loaded
packing,
refer to the note at the beginning of the
Packing Maintenance section.
For other packing types,
tighten the packing flange
nuts alternately in small equal increments until one
of the nuts reaches the minimum recommended
torque shown in table. Then, tighten the remaining
flange nuts until the packing flange is level and at a
90-degree angle to the valve stem.
15. 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
Observe the warning at the start of the
Maintenance section.
CAUTION
In the following applicable procedures,
to avoid damaging parts, do not grip
the bellows shroud or other parts of
the stem/bellows assembly. Grip only
the flat areas on the stem where it
extends out of the top of the bellows
shroud.
For C-seal construction, see the appropriate C-seal
sections in this instruction manual.
Except where indicated, key numbers in this section
are referenced in figure 22 for Design EWD
constructions, figure 22 for restricted trim detail,
figure 23 for Design EWS constructions, and
