Retrofit: Installing Bore Seal Trim - Fisher EHD Instruction Manual

Instruction Manual
April 2009
RETAINER
PLUG
FLOW DOWN
RETAINER
PLUG
FLOW UP

Retrofit: Installing Bore Seal Trim

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:
CAGE
SEATING AREA
BORE SEAL
PISTON RING
CAGE
SEATING AREA
BORE SEAL
VIEW A
Figure 5. Fisherr EHD with Bore Seal Trim
Note
EH Valves (NPS 8 through 14)
PISTON RING
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).
A
CAUTION
13