Instruction Manual
D101634X012
HP and HPA Valves
October 2014
20
Trim Replacement
WARNING
Observe the warning at the start of the Maintenance section.
After all trim maintenance has been completed, reassemble the valve body by following the numbered steps below. Be
certain that all gasketed surfaces have been well cleaned. Key numbers referenced in this procedure are shown in
figure 16, 17, or 18, except where indicated.
CAUTION
Inspect the seat ring, cage, bonnet, and body gasket surfaces. These surfaces must be in good condition, with all foreign
material removed. Small burrs less than approximately 0.076 mm (0.003 inches) in height (the thickness of a human hair)
can be ignored. Scratches or burrs that run across the serrations are not permitted under any conditions, since they will
prevent the gaskets from sealing properly.
1. Install the seat ring gasket (key 12) into the valve body. Install the seat ring (key 4).
2. Install the cage.
Constructions other than TSO trim
1. To install the piston rings and seal rings (key 8), proceed as appropriate:
For an HPD or HPAD valve, if it is necessary to install new piston rings, the replacement piston rings will arrive in one
piece. Use a vise with smooth or taped jaws to break a replacement piston ring into halves. Place the new ring in the
vise so that the jaws compress the ring into an oval. Compress the ring slowly until the ring snaps on both sides. If one
side snaps first, do not try to tear or cut the other side. Instead, keep compressing until the other side snaps. The
piston ring can also be fractured by scoring and snapping over a hard surface such as a table edge. Sawing or cutting is
not recommended.
Remove any protective tape or c overing from the valve plug and stem assembly, and set i t on a protective surface.
Then, place the piston rings in the piston ring grooves with the fractured ends matched.
For an HPT or HPAT valve, install the seal ring (key 8) onto the valve plug (key 5). Install the ring with the open side
facing the seat ring end of the v alve plug for flow-down applications (view A of figure 19) or with the open side facing
the valve plug stem end of the valve plug for flow-up applications (view B of figure 19). Slide the backup ring (key 9)
onto the valve plug. Secure with the retaining ring (key 10).
2. Install the valve plug into the cage.
TSO Trim
TSO trim: 0.8125 Inch Port Diameter (figure 7)
1. Thread the outer plug onto the inner plug until the parts seat metal t o metal, using a strap wrench or similar tool
that will not damage the outer plug guide surfaces.
2. Mark the inner plug and outer plug with alignment marks in the assembled position.
(175 paginas)
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