Instruction Manual
D102175X012
EZ-C, ET-C, and EWT-C Valves
July 2017
8
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.
D
To avoid personal injury or damage to the seating surface caused by the valve plug and stem assembly dropping from
the bonnet after being lifted out of the valve body, observe the following instructions.
4.
When lifting an EZ‐C bonnet,
temporarily install a valve stem locknut on the valve stem. This locknut will prevent
the valve plug and stem assembly from dropping out of the bonnet.
5.
When lifting an ET‐C or EWT‐C bonnet,
be sure the plug and stem assembly and cage remain in the valve body.
WARNING
To avoid possible personal injury, review your process shutdown procedures to be sure process pressure is not applied to
the valve for the following procedure.
6. Hex nuts (key 16) attach the bonnet to the valve body (key 1). Loosen these nuts or cap screws approximately 3 mm
(1/8 inch). Then, loosen the body‐to‐bonnet joint by either rocking the bonnet or prying between the bonnet and
valve body. Work with a prying tool around the bonnet until the bonnet loosens.
Table 3. Recommended Torque for Packing Flange Nuts
VALVE STEM DIAMETER
PRESSURE
RATING
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, NPS
BOLT TORQUES
(1)
Bolt Material
(2)
B8M
(3)
or S20910 (XM‐19)
(4)
N
S
m
Lbf‐ft
1
122
90
1-1/2 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. For bolting materials not listed in table 4, contact your
Emerson sales office
or Local Business Partner for torque information.
3.SA193‐B8M strain hardened.
4.Hot rolled.
