Instruction Manual
D103553X012
Large ET and ED Valves
July 2017
14
3. Referring to figure 3, locate the 1/4-inch diameter hole in the groove where the piston ring was installed.
4. Select an appropriate tool such as a punch and place the tip of the tool into the hole with the body of the tool held
tangent to the outside diameter of the retainer. Strike the tool with a hammer to rotate the retainer and free it from
the valve plug. Remove the retainer from the valve plug.
5. Use an appropriate tool such as a flat-blade screwdriver to pry the bore seal (key 64) off the valve plug. Use caution
to avoid scratches or other damage to the seating surfaces where the bore seal makes contact with the valve plug
(see figure 3).
Figure 3. Fisher ED/EWD Valve Equipped with the Bore Seal
FLOW DOWN
FLOW UP
PLUG
RETAINER
BORE SEAL
PISTON RING
CAGE
CAGE
BORE SEAL
PLUG
SEATING AREA
PISTON RING
SEATING AREA
STAKE
THREADS
HERE
STAKE
THREADS
HERE
RETAINER
1/4” DIA HOLE
(BEHIND THE PISTON RING)
1/4” DIA HOLE
(BEHIND THE PISTON RING)
6. 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).
7. 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.
8. 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 valve plug. For flow down constructions, skip to step 10.
9. 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.
10. 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 12.
11. 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.
12. 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).
13. Inspect the valve plug (key 2A) and stem (key 2B) for nicks, scratches, or other damage that would prevent proper
operation of the valve. If replacement of either is necessary replace as a complete valve plug and stem assembly
(key 2).
