Instruction Manual
D100714X012
461 Valve
June 2017
10
When all nuts are tightened to that torque value, increase the torque by 1/4 of the specified nominal torque and
repeat the crisscross pattern. Repeat this procedure until all nuts are tightened to the specified nominal value. Apply
the final torque value again and, if any nut still turns, tighten every nut again.
Note
When installing packing rings, prevent entrapping air between the rings. Add the rings one at a time without forcing them below
the chamfer of the packing box entrance chamber. As each successive ring is added, the stack should not be pushed down more
than the thickness of the added ring (figure 5).
15. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 3. If
desired, packing parts may be pre‐lubricated with a silicon base grease for easier installation. Slip a smooth‐edged
pipe over the valve stem, and gently tamp each soft packing part into the packing box, being sure that air is not
trapped between adjacent soft parts.
16. Slide the packing follower, wiper, and packing flange into position. Lubricate the packing flange studs (key 24) and
the faces of the packing flange nuts (key 25). Replace the packing flange nuts.
For the spring‐loaded PTFE V‐ring packing shown in figure 3, tighten the packing flange nuts until the shoulder on the
packing follower (key 29) contacts the bonnet.
For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 2. Then,
loosen the packing flange nuts, and retighten them to the recommended minimum torque shown in table 2.
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 3. Then, tighten the remaining flange nuts until the
packing flange is level and at a 90‐degree angle to the valve stem.
For ENVIRO‐SEAL or HIGH‐SEAL live‐loaded packing, refer to the note at the beginning of the Maintenance section.
17. Mount the actuator on the valve body assembly, and reconnect the actuator and valve plug stems according to
the procedures in the appropriate actuator instruction manual.
Table 2. Recommended Torque for Graphite Type Packing Flange Nuts (non live-loaded)
VALVE STEM DIAMETER
PRESSURE RATING
TORQUE
NSm lbfSft
mm Inches Min Max Min Max
19.1 3/4
CL600 21 31 15 23
CL900 27 41 20 30
CL1500 34 50 25 37
CL2500 41 61 30 45
25.4 1
CL600 35 53 26 39
CL900 42 62 31 46
CL1500 52 77 38 57
CL2500 61 91 45 67
31.8 1-1/4
CL600 49 74 36 55
CL900 56 83 41 61
CL1500 68 102 50 75
CL2500 81 122 60 90
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