ET Valve
Instruction Manual
Form 5081
June 2002
13
the cage or cage retainer gaskets and place another
flat sheet gasket (key 10) on top of the adaptor or
spacer. If there is only a cage retainer, place another
flat sheet gasket on the retainer.
7. With an 8-inch Design ET valve, install the load
ring (key 26).
8. Mount the bonnet on the valve body and
complete assembly according to steps 10 through 14
of the Replacing Packing procedure. Be sure to
observe the note prior to step 10.
ENVIRO-SEAL Bellows Seal Bonnet
Replacing a Plain or Extension Bonnet
with an ENVIRO-SEAL Bellows Seal
Bonnet (Stem/Bellows Assembly)
1. Remove the actuator and bonnet according to
steps 1 through 5 of the Replacing Packing
procedure in the Maintenance section.
2. With care, remove the valve plug and stem
assembly from the valve body. If necessary, also lift
out the cage.
3. Remove and discard the existing bonnet gasket.
Cover the valve body opening to protect sealing
surfaces and to prevent foreign material from
entering the valve body cavity.
Note
The ENVIRO-SEAL stem/bellows
assembly for Design E valves is
available only with a threaded and
drilled plug/adaptor/stem connection.
The existing valve plug can be reused
with the new stem/bellows assembly
or a new plug can be installed.
4. Inspect the existing valve plug. If the plug is in
good condition, it can be reused with the new
ENVIRO-SEAL stem/bellows assembly. To remove
the existing valve plug from the stem, first, place the
existing plug stem assembly and valve plug in a
soft-jaw chuck or other type of vise so that the jaws
grip a portion of the valve plug that is not a seating
surface. Drive out or drill out the pin (key 8).
5. Reverse the plug stem assembly in the soft-jaw
chuck or vise. Grip the valve stem in an appropriate
place and unscrew the existing plug from the valve
stem.
Table 6. Recommended Torque for ENVIRO-SEAL Bellows
Seal Packing Flange Nuts
VALVE
SIZE,
VALVE
STEM
DIAMETER
MINIMUM
TORQUE
MAXIMUM
TORQUE
SIZE,
INCHES
DIAMETER
THROUGH
PACKING
Nm Lbfin Nm Lbfin
1 - 2 1/2 2 22 4 33
3 - 8 1 5 44 8 67
CAUTION
When installing a valve plug on the
ENVIRO-SEAL stem/bellows assembly,
the valve stem must not be rotated.
Damage to the bellows may result.
Do not grip the bellows shroud or
other parts of the stem/bellows
assembly. Grip only the flat areas on
the stem where it extends out of the
top of the bellows shroud.
Note
The ENVIRO-SEAL stem/bellows
assembly has a one-piece stem.
6. To attach the valve plug to the stem of the new
ENVIRO-SEAL stem/bellows assembly, first attach
the plug to the adaptor (key 24). Locate the adaptor.
Notice that a hole has not been drilled in the threads
where the plug screws onto the adaptor. Secure the
valve plug in a soft-jaw chuck or other type of vise.
Do not grip the plug on any seating surface. Position
the plug in the chuck or vise for easy threading of
the adaptor. Thread the adaptor into the valve plug
and tighten to the appropriate torque value.
7. Select the proper size of drill bit and drill through
the adaptor using the hole in the valve plug as a
guide. Remove any metal chips or burrs and drive in
a new pin to lock the plug/adaptor assembly
together.
8. Attach the plug/adaptor assembly to the
ENVIRO-SEAL stem/bellows assembly by first
securing the stem/bellows assembly in a soft-jaw
chuck or other type of vise so that the jaws of the
chuck or vise grip the flats of the stem extending out
of the top of the bellows shroud. Screw the valve
plug/adaptor assembly onto the valve stem. Tighten
as necessary to align the pin hole in the stem with
one of the holes in the adaptor. Secure the adaptor
to the stem with a new pin.
9. Inspect the seat ring (key 9) and soft seat parts
(keys 21, 22, and 23); replace, if necessary.
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