Instruction Manual
D103172X012
TBX Valve
May 2014
15
6. Insert the lubricated cage (key 21) into the valve body. Ensure the lower cage diameter slides over the outside
diameter of the seat ring. If there is any question regarding the proper seating of the cage inside the valve body, the
following measurements can be taken for confirmation. Measure the thickness of the cage flange at its largest
diameter. Measure the depth of the mating counterbore where the cage flange engages into the valve body. When
assembled with a new cage gasket, the resulting depth from the top of the valve body to the top of the cage flange
should be the difference in these two measured valves, minus an additional 0.045 inches to allow for the
uncompressed gasket. Lubricate the inside of the cage as completely as possible.
7. Flow Up Construction only: If applicable, install the magnetite catcher (key 79) by threading into the bore of the
plug (key 22). Apply four tackwelds equally spaced along the circumference of the plug to prevent rotation during
service.
If the TBX is an ANSI/FCI 70
2 Class V construction, proceed with steps 8
15; otherwise proceed directly to step 16 for
Class IV constructions.
8. The plug assembly includes a plug (key 22), stem (key 23), stem pin (key 53), retainer (key 25), piston ring (key 45)
and Bore Seal ring (key 46). Lubricate the plug assembly at all raised outside diameter surfaces and lubricate the
piston ring(s) and Bore Seal ring.
9. Orient the Bore Seal for correct sealing action based on the process fluid flow direction through the valve, refer to
figure 5 to complete this step.
Figure 5. Fisher Bore Seal Construction
FLOW-UP
PISTON RING
RETAINER
CAGE
BORE SEAL
PLUG
SEATING AREA
FLOW-DOWN
PISTON RING
RETAINER
CAGE
BORE SEAL
PLUG
SEATING AREA
10. 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. Do not force the Bore Seal over the plug (figure 6).
11. For the Flow
up design, the Bore Seal installation tool (figure 10) must be inserted into the Bore Seal prior to using
the retainer to guide it down the plug.
12. 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.
13. If applicable, 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.
14. Using an appropriate tool such as a center punch, stake the threads on top of the plug in one place to secure the
Bore Seal retainer.
