Instruction Manual
D100399X012
EW Valve
July 2017
14
Trim Maintenance
WARNING
Avoid personal injury or property damage from sudden release of process pressure. Before performing any maintenance
operations:
D
Do not remove the actuator from the valve while the valve is still pressurized.
D
Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D
Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D
Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
on both sides of the valve. Drain the process media from both sides of the valve.
D
Vent the pneumatic actuator loading pressure and relieve any actuator spring precompression.
D
Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D
The valve packing box may contain process fluids that are pressurized,
even when the valve has been removed from the
pipeline.
Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
D
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Table 5. Body‐to‐Bonnet Bolt Torque Guidelines
VALVE SIZE, NPS
BOLT TORQUES
(1, 2)
N
S
m
Lbf
S
ft
4x2
102
75
6x4 or 8x4
259
191
8x6
CL300 or CL600
548
404
CL900
1315
970
10x8
745
550
12x6
548
404
12x8
CL300 or CL600
732
540
CL900
2712
2000
1. Determined from laboratory tests.
2. For other materials, contact your
or Local Business Partner for torques.
Table 6. Recommended Torque for Packing Flange Nuts
VALVE STEM
DIAMETER
PRESSURE
RATING
GRAPHITE TYPE PACKING
PTFE TYPE PACKING
Minimum Torque
Maximum Torque
Minimum Torque
Maximum Torque
mm
Inches
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
CL600
9
81
14
122
4
39
7
58
19.1
3/4
CL300
15
133
23
199
7
64
11
95
19.1
CL600
21
182
31
274
10
87
15
131
25.4
1
CL300
26
226
38
339
12
108
18
162
25.4
CL600
35
310
53
466
17
149
25
223
31.8
1‐1/4
CL300
36
318
54
477
17
152
26
228
31.8
CL600
49
437
74
655
24
209
36
314