
EH Valves (NPS 8 through 14)
Instruction Manual
April 2009
13
Figure 5. Fisher
r
EHD 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
A
VIEW A
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 5).