
ET Valve
Instruction Manual
Form 5081
June 2002
9
Figure 6. TSO (Tight Shutoff Trim), Detail of Protected Soft Seat
INNER PLUG
OUTER PLUG
CAGE
SEAT RING
PROTECTED SOFT SEAT
A7088 / IL
torque shown in table 4. Then, tighten the remaining
flange nut 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
Packing Maintenance.
14. 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
Except where indicated, key numbers in this section
are referenced in figure 16 for standard 1- through
6-inch constructions, figure 17 for Whisper Trim III
detail, figures 18 and 19 for WhisperFlo trim, and
figure 20 for Cavitrol III detail and the 8-inch Design
ET valve.
Disassembly
1. Remove the actuator and the bonnet according to
steps 1 through 6 of the Replacing Packing
procedure in the Maintenance section.
WARNING
Any damage to the gasket sealing
surfaces could cause the valve to leak.
The surface finish of the valve stem
(key 7) is critical for making a good
packing seal. The inside surface of the
cage or cage/baffle assembly (key 3),
or cage retainer (key 31), is critical for
smooth operation of the valve plug.
The seating surfaces of the valve plug
(key 2) 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. Remove the packing flange nuts, packing flange,
upper wiper, and packing follower (keys 5, 3, 12, and
13 in figure 14). Carefully push out all the remaining
packing parts from the valve side of the bonnet using
a rounded rod or other tool that will not scratch the
packing box wall. Clean the packing box and the
metal packing parts.
3. Inspect the valve stem threads and packing box
surfaces for any sharp edges which might cut the
packing. Scratches or burrs could cause packing box
leakage or damage to the new packing. If the
surface condition cannot be improved by light
sanding, replace the damaged parts.
4. Remove the load ring (key 26) from an 8-inch
Design ET valve, or the cage adaptor (key 4) from
any restricted-trim valve through 4 inches, and wrap
it for protection.
5. On a 6-inch Design ET valve with Whisper Trim III
or WhisperFlo cage, also remove the bonnet spacer
(key 32) and bonnet gasket (key 10) on top of the
spacer. Then on any construction with a cage retainer
(key 31), remove the cage retainer and its associated