Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
18
Bore Seal Retrofit
Note
Additional actuator thrust is required for a valve equipped with the bore seal. When installing the bore seal in an existing valve,
contact your Emerson sales office
or Local Business Partner for assistance in determining new actuator thrust requirements.
The bore seal retrofit will require a new valve plug and stem assembly (key 2), bore seal (key 64), and piston ring
(key 6). The following steps will guide you in the assembly of these parts. Final installation into the valve body will be
per the Assembly procedure.
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. Also, lubricate the outside
diameter of the valve plug where the bore seal must be pressed into the proper seating position (see figure 3).
2. Referring to figure 3, orient the bore seal for correct sealing action based on the process fluid flow direction through
the valve.
D The open interior of the bore seal must face up in a valve with flow-up construction.
D The open interior of the bore seal must face down in a valve with flow-down construction.
3. Place the bore seal over the top of the valve plug. The retainer will help guide the bore seal down onto the valve
plug. Do not force the bore seal over the plug. For flow-down constructions, skip to step 5.
4. An installation tool (see figure 4 and table 5) must be inserted into the bore seal prior to using the retainer to guide
it down the valve plug.
5. Apply a suitable high-temperature lubricant to the threads on the valve plug. Then, place the retainer onto the valve
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 retainer back onto the valve 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 valve plug in one place to secure
the retainer (see figure 3).
8. Each new piston ring (key 6) is furnished as a complete ring, and each must be broken into two approximately equal
portions. Do this by placing the ring on edge on a smooth, hard surface and striking the ring squarely with a
hammer.
9. Install the piston ring into the groove in the retainer (key 2C). Be sure to match the broken ends when installing the
ring sections in the groove.
CAUTION
To avoid excessive leakage and seat erosion, the valve plug must be initially seated with sufficient force to overcome the
resistance of the Bore Seal and contact the seat ring. You can correctly seat the valve plug by using the same force
calculated for full load when sizing your actuator. With no pressure drop across the valve, this force will adequately drive
the valve plug to the seat ring, giving the Bore Seal a predetermined permanent set.
With full actuator force applied and the valve plug fully seated, align the actuator travel indicator scale with the lower end
of valve travel. Refer to the appropriate actuator instruction manual for information on this procedure.
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