Instruction Manual
D102010X012
EU and EW Series Valves
July 2017
18
Figure 8. 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
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 sales office
or Local Business Partner 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 8).
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 8).
D The open interior of the Bore Seal plug seal must face down in a valve with flow‐down construction (figure 8).
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 8). 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.
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