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)
NSm LbfSft
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 Emerson sales office
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 NSm LbfSIn NSm LbfSIn NSm LbfSIn NSm LbfSIn
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
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