ES Valve
Instruction Manual
December 2008
12
bellows shroud with a soft-jaw chuck or other type of
vise. 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.
Assembly
Except where indicated, key numbers are referenced
in figure 13 for standard NPS 1/2 through 6
constructions, figure 14 for NPS 8 ES valves,
figure 15 for Whisper Trim III cage detail, and
figure 16 for WhisperFlo trim.
1. With a restricted trim seat ring construction, install
the adaptor gasket (key 14) and seat ring adaptor
(key 5).
2. Install the seat ring gasket (key 13), seat ring or
liner (key 9), or disk seat (key 22). With a PTFE seat
construction, install the disk and disk retainer
(keys 21 and 23).
3. Install the cage or cage/baffle assembly (key 3).
Any rotational orientation of the cage or assembly
with respect to the valve is acceptable. A Whisper
Trim III cage designated by level A3, B3, or C3 may
be installed with either end up. The level D3
cage/baffle assembly, however, must be installed
with the hole pattern end next to the seat ring. If a
cage retainer (key 31) is to be used, place it on top
of the cage.
4. Slide the valve plug (key 2) and stem assembly,
or valve plug and ENVIRO-SEAL bellows seal
assembly, into the cage.
5. Place the gaskets (key 10, or keys 11, 12 and 14,
if used) and the shim (key 27 or key 51) on top of the
cage or cage retainer. If there is a cage adaptor
(key 4) or a bonnet spacer (key 32), set it on 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.
6. With an NPS 8 ES valve, install the load ring
(key 26).
CAUTION
To avoid damaging packing with the
valve stem threads, use care when
installing the bonnet if the packing
was not removed from the bonnet.
Table 7. Recommended Torque for ENVIRO-SEAL
r
Bellows Seal Packing Flange Nuts
VALVE
SIZE
VALVE STEM
DIAMETER
THROUGH
PACKING
MINIMUM TORQUE
MAXIMUM
TORQUE
NPS
Inch
N
S
m
Lbf
S
in
N
S
m
Lbf
S
in
1/2 - 2
1/2
3
24
5
48
3 - 4
1
7
60
10
84
7. Mount the bonnet on the valve and complete
assembly according to steps 10 through 14 of the
Replacing Packing procedure, omitting steps 11
and 12 if new packing is not being installed, and
being sure to observe the note prior to step 11.
ENVIRO-SEAL
r
Bellows Seal and
Bonnet
Replacing a Plain or Extension Bonnet
with an ENVIRO-SEAL Bellows Seal
(Stem/Bellows Assembly) and Bonnet
1. Remove the actuator and bonnet according to
steps 1 through 6 of the Replacing Packing
procedure of the Maintenance section.
2. With care, remove the valve plug and stem
assembly from the valve body. If necessary, lift out the
cage, also.
CAUTION
To prevent possible product damage,
cover the opening in the valve in the
following procedure to protect the
sealing surfaces and to prevent
foreign material from getting into the
valve body cavity.
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 easy-e
r
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
