EU and EW Series Valves
Instruction Manual
August 2010
17
Figure 10. Fisher EUD and EWD with Bore Seal Trim
FLOW DOWN
FLOW UP
PLUG
RETAINER
BORE SEAL
PISTON RING
CAGE
RETAINER
CAGE
BORE SEAL
PLUG
SEATING AREA
PISTON RING
SEATING AREA
CAUTION
If the packing is to be reused and was
not removed from the bonnet, use care
when installing the bonnet to avoid
damaging the packing with the valve
stem threads.
5. Mount the bonnet on the valve, and complete
assembly according to steps 15 through 19 of the
Replacing Packing section, omitting steps 16 and 17
if new packing is not being installed and being sure
to observe the note before step 15.
Retrofit: Installing Bore Seal Trim
Note
Additional actuator thrust is required
for a valve with Bore Seal trim. When
installing Bore Seal trim in an existing
valve, contact your Emerson Process
Management sales office for
assistance in determining new
actuator thrust requirements.
Assemble the new valve plug/retainer assembly
(with Bore Seal plug seal) using the following
instructions:
CAUTION
To avoid leakage when the valve is
returned to service, use appropriate
methods and materials to protect all
sealing surfaces of the new trim parts
while assembling the individual parts
and during installation in the valve
body.
1. Apply a suitable high-temperature lubricant to the
inside diameter of the Bore Seal plug seal. Also,
lubricate the outside diameter of the valve plug
where the Bore Seal plug seal must be pressed into
the proper sealing position (figure 10).
2. Orient the Bore Seal plug seal for correct sealing
action based on the process fluid flow direction
through the valve.
D
The open interior of the Bore Seal plug seal
must face up in a valve with flow-up construction
(figure 10).
D
The open interior of the Bore Seal plug seal
must face down in a valve with flow-down
construction (figure 10).
3. Place the Bore Seal plug seal over the top of the
valve plug. The retainer will help guide the Bore Seal
down onto the plug (figure 10). Do not force the Bore
Seal over the plug. For flow down constructions, skip
to step 5.
4. An installation tool (see table 5) must be inserted
into the Bore Seal prior to using the retainer to guide
it down the plug.
