Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
9
11. Lubricate the studs (key 15) and install hex nuts (key 16), using accepted bolting procedures during tightening, so
that the body-to-bonnet joint will withstand test pressures and application service conditions. Use the bolt torques
in table 4 as guidelines.
12. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 2. Place a
smooth‐edged pipe over the valve stem, and gently tap each soft packing part into the packing box one piece at a
time, being sure that air is not trapped between adjacent soft parts.
13. Slide the packing follower (key 13, figure 2), upper wiper (key 12, figure 2), and packing flange (key 37) into
position. Lubricate the packing flange studs (key 4) and the faces of the packing flange nuts (key 5). Replace the
packing flange nuts.
14. For spring‐loaded PTFE V‐ring packing, tighten the packing flange nuts until the shoulder on the packing follower
(key 13, figure 2) contacts the bonnet.
For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 3. Then,
loosen the packing flange nuts and retighten them to the recommended minimum torque shown in table 3.
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 nut until the
packing flange (key 3, figure 2) is at a 90‐degree angle to the valve stem.
15. Mount the actuator on the valve assembly, and reconnect the actuator and valve stem according to the procedure
in the appropriate actuator instruction manual.
Trim Maintenance
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
Disassembly
1. Complete steps 1 through 5 of the Replace Packing section to remove the actuator, bonnet, and plug and stem
from the valve body. Remove the bonnet gasket (key 11).
WARNING
To avoid personal injury due to leaking fluid, avoid damaging gasket sealing surfaces. The surface finish of the valve stem
(key 2B) is critical for making a good packing seal. The inside surface of the cage (key 3) is critical for smooth operation of
the valve plug. The seating surfaces of the valve plug (key 2A) and seat ring (key 9) are critical for proper shutoff. Unless
inspection reveals otherwise, assume all these parts are in good condition and protect them accordingly.
2. Packing parts can be removed if desired. Replace these parts as described in the Replace Packing section.
3. Install 3/8”-16 UNC-2A eye bolts with a minimum threaded length of 13 mm (0.5 inches) into the tapped holes in
the top of the cage (key 3) and carefully lift it out of the valve body. For ET/EWT valves, the seat ring (key 9) will be
removed with the cage as an assembly due to the seat ring being screwed into the bottom of the cage and secured
with tack welds. If the cage is stuck in the valve, use a rubber mallet to strike the exposed portion of the cage at
several points around its circumference. Set the part(s) on a protective surface to prevent damage to gasket or
seating surfaces.
4. Remove the cage gasket (key 11).
5. Proceed as appropriate:
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