Instruction Manual
D101634X012
HP and HPA Valves
October 2014
24
Retrofit: Installing C-seal Trim
Note
Additional actuator thrust is required for a valve with C-seal trim. When installing C-seal trim in an existing v alve, 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:
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 C-seal plugseal.Also,lubricatethe
outside diameter of the valve plug where the C-seal plug seal must be pressed into the proper sealing position
(figure 10).
2. Orient the C-seal plug seal for correct sealing action based on the process fluid flow direction through the valve.
D The open interior of the C-seal plug seal must face up in a valve with flow-up construction (figure 10).
D The open interior of the C-seal plug seal must face down in a valve with flow-down construction (figure 10).
Note
An installation tool must be used to properly position the C-seal plug seal on the valve plug. A tool is available as a Fisher spare part
or a tool could be manufactured following the dimensions given in figure 11.
3. Place the C-seal plug seal over the top of the valve plug and press the C-seal plug seal onto the plug using the C-seal
installation tool. Carefully press the C-seal plug seal onto the plug until the installation tool contacts the horizontal
referencesurfaceofthevalveplug(figure12).
4. Apply a suitable high-temperature lubricant to the threads on the plug. Then, place the C-seal retainer onto the
plug and tighten the retainer using an appropriate tool such as a strap wrench.
5. Using an appropriate tool such as a center punch, stake thethreadsontopofthepluginoneplace(figure13)to
secure the C-seal retainer.
6. Install the new plug/retainer assembly with C-seal plug seal on the new stem following the appropriate instructions
in the Trim Replacement section in this manual.
7. Install piston rings by following instructions in the Trim Replacement section in this manual.
8. Remove the existing valve actuator and bonnet following the appropriate instructions in the Replacing Packing
sectioninthismanual.
CAUTION
Do not remove the existing valve stem from the valve plug unless you are planning to replace the valve stem.
Never reuse an old valve stem with a new plug or reinstall a valve stem after it has been removed. Replacing a valve stem
requires drilling a new pin hole in the stem. This drilling weakens the stem and may cause failure in service. However, a
used valve plug may be reused with a new valve stem.
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