Fisher EHD series, Инструкция по эксплуатации, Страница: 17 / 32

Instruction Manual
D100392X012
EH Valves NPS 8 through 14
June 2017
17
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 5).
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 5).
D
The open interior of the Bore Seal plug seal must face down in a valve with flow‐down construction (figure 5).
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 5). Do not force the Bore Seal over the plug. For flow down constructions, skip to step 5.
4. An installation tool (see table 8) must be inserted into the Bore Seal prior to using the retainer to guide it down the
plug.
5. Apply a suitable high‐temperature lubricant to the threads on the plug. Then, place the Bore Seal retainer onto the
plug and tighten the retainer using an appropriate tool such as a strap wrench. For flow down constructions, skip to
step 7.
6. Remove the retainer and then the installation tool. Place the Bore Seal retainer back onto the plug and tighten the
retainer using an appropriate tool such as a strap wrench.
7. Using an appropriate tool such as a center punch, stake the threads on top of the plug in one place (figure 7) to
secure the Bore Seal retainer.
8. Install the new plug/retainer assembly with Bore Seal plug seal on the new stem following the appropriate
instructions in the Trim Replacement section of this manual.
9. Install piston rings by following instructions in the Trim Replacement section of this manual.
10. Remove the existing valve actuator and bonnet following the appropriate instructions in the Replacing Packing
section of this manual.