Instruction Manual
Instruction Manual
D100391X012
EDR and ETR Valves
April 2011
9
For all except spring‐loaded packing, if the packing is relatively new and tight on the stem, and if tightening the
packing flange nuts does not stop the leakage, it is possible that the valve stem is worn or nicked so that a seal cannot
be made. If the leakage comes from the outside diameter of the packing follower, it is possible that the leakage is
caused by nicks or scratches around the inside of the packing box wall.
For spring‐loaded single PTFE V‐ring packing, the spring (key 8) maintains a sealing force on the packing. If leakage is
noted around the packing follower (key 13), check to be sure the shoulder on the packing follower is touching the
bonnet. If the shoulder is not touching the bonnet, tighten the packing flange nuts (key 5, figure 4) until the shoulder
is against the bonnet. If leakage cannot be stopped in this manner, proceed to the Removing Packing and Installing
Packing procedures below.
Removing Packing
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
The packing may have been removed in earlier steps, or during trim maintenance procedures. Use the following steps,
when necessary, to remove packing and associated assemblies.
Key number locations for packing parts are shown in figures 5 and 6. For valve parts and the live loaded packing
system, refer to figures 8 through 10 (in the Parts List section), for key number locations.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut off all pressure lines to the power
actuator and release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures
stay in effect while you work on the equipment.
2. Exhaust all actuator pressure, disconnect the operating lines from the actuator, and disconnect any leakoff piping
from the actuator. Relieve any actuator precompression from the stem connector. (If necessary, refer to the
appropriate actuator instruction manual for warnings, cautions, and disassembly procedures.)
3. When removing the bottom flange (key 31), be careful that the cage and other parts are not damaged by
unexpectedly falling out of the valve body. Remove the nuts (key 16) or cap screws from the bottom flange.
4. To remove the packing for maintenance, disconnect the stem connector (see figure 2). Remove the yoke locknut,
and lift the actuator off the valve.
5. Remove the packing flange nuts (key 5, figure 4), packing flange (key 15), upper wiper (key 12), and packing
follower (key 13). If maintaining the packing while the valve stem is in place, ensure that the valve stem surface is
not scratched or marred while working with the packing.
Table 4. Recommended Torque for Packing Flange Nuts
VALVE STEM
DIAMETER
PRESSURE
RATING
GRAPHITE PACKING PTFE PACKING
Minimum Torque Maximum Torque Minimum Torque Maximum Torque
mm Inches NSm LbfSin NSm LbfSin NSm LbfSin NSm LbfSin
9.5 3/8
CL125, 150 3 24 5 48 1 12 3 24
CL250, 300 4 36 7 60 2 18 3 30
CL600 5 48 8 72 3 24 4 36
12.7 1/2
CL125, 150 5 48 8 72 3 24 4 36
CL250, 300 7 60 10 84 3 30 5 42
CL600 10 84 14 120 5 42 7 60
19.1 3/4
CL125, 150 11 96 16 144 5 48 8 72
CL250, 300 14 120 20 180 7 60 10 90
CL600 20 180 30 264 10 90 15 132