Retrofit: Installing C-Sealt Trim - Fisher EWS Series Instruction Manual

EW Valve
alignment marks line up. This will ensure that the
plug parts are metal to metal and the seal is
compressed properly. Do not damage the outer plug
guide surfaces.
D Install set screws centering the inner plug in the
outer plug and torque to 11 NSm (8 lbfSft).
D Assemble the piston ring, anti-extrusion rings,
backup ring, and retainer.
6. For all constructions, place the gaskets
(keys 12, 11 or 14 if used, and 10) and the shim, if
used (key 53), 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 adapter or spacer. If there is only a cage
retainer or bonnet spacer, place another flat sheet
gasket on the retainer or spacer.
7. With an NPS 10x8 or 12x8 valve, install the load
ring (key 26).
8. Mount the bonnet on the valve, and complete
assembly according to steps 11 through 15 of the
Replacing Packing section. Be sure to observe the
note prior to step 11.
16
64
FLOW DOWN
7
8
65
64
2
9
A6790 / IL
Figure 9. Design EWD with C-sealt Trim
64
FLOW UP
VIEW A
A
Retrofit: Installing C-seal Trim
Additional actuator thrust is required
for a valve with C-seal trim. When
installing C-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 C-seal plug seal) using the following
instructions:
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 C-seal plug seal. Also,
lubricate the outside diameter of the valve plug
Instruction Manual
Form 2376
March 2007
Note
CAUTION