Design CAV4
12
Figure 9. Trim Surfaces Requiring Lubrication
and Recommended Lubricants
48A6264-A
A2935-1/IL
LUBRICATION REQUIRED, USE BELL-RAY MOLYLUBE
NO. 80, DOW CORNING MOLYKOTE, OR NEVER-SEEZ
PURE NICKEL SPECIAL, OR EQUIVALENT.
Do not lubricate the gasket surfaces.
Position the valve vertically and careful-
ly lower the lower cage assembly into
the valve body. When inserting the as-
sembly, use an even motion; do not rock
the lower cage assembly while installing
it. Use care to avoid damaging the cage
gasket (key 7).
2. Install a new cage gasket (key 7), and insert the
lower cage assembly (key 2) into the valve body. If
installing the separable seat ring (key 35), first install
the O-ring (key 36) around the bottom diameter of the
seat ring.
3. Thread the cage retainer (key 5) into the valve
body. Use the cage retainer tool (figure 6) to tighten
the cage retainer as follows:
a. Insert the tool into the valve body. Be certain the
tool lugs are engaged in the corresponding re-
cesses in the retainer.
CAUTION
Do not use an impact wrench to remove
or install the seat ring retainer. Damage
to cage retainer, valve body threads, and
lower cage could result.
b. Use a power torque wrench having torque capa-
bilities equal to or greater than those shown in figure
6. Connect the power torque wrench to a standard
socket wrench extension or other suitable tool. The
extension or tool must fit snugly into the square hole
or the hex head of the cage retainer tool. Refer to
figure 6 for square hole or hex head sizes.
c. Insert the extension into the cage retainer tool.
d. Use the stud bolts (key 28) to prevent the power
torque wrench from rotating.
CAUTION
Hold the power torque wrench and at-
tached socket wrench extension at right
angles to the cage retainer when apply-
ing torque. Tilting the wrench and exten-
sion while applying torque causes the
lugs on the cage retainer tool to sudden-
ly disengage from the recesses in the
retainer, damaging the retainer and low-
er cage assembly.
e. Tighten the cage retainer (key 5) to the torque
shown in figure 6.
4. Install a new lower bonnet gasket (key 6), and in-
sert the upper cage (key 3). Be sure the lugs on the
bottom of the cage engage the corresponding slots in
the cage retainer (key 5).
Note
Rotate the upper cage (key 3) clockwise
by hand as much as possible once the
cage lugs engage the slots in the cage
retainer (key 5). Failure to do so may re-
sult in slight seat leakage.
5. For stem-balanced valve plug, proceed to step 6.
For piston ring valve plug, if installing new graphite
piston rings (key 11), each replacement ring will arrive
in one piece. Use a vise with smooth jaws to break this
replacement ring into halves. Place the new ring in the
vise so that the jaws will compress the ring into an
oval. Slowly compress the ring 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 the ring
until the other side snaps.
With the valve plug and stem assembly (key 4) on a
protective surface, place the piston rings in the piston
ring grooves with the fractured ends matched. Rotate
the rings in the grooves so that all the matched ends
are at different points around the plug circumference.
For seal ring valve plug, install the seal ring (key 8)
with the open side facing the four flutes on the valve
plug. Slide the 2-piece anti-extrusion ring (key 37) and
the backup ring (key 9) onto the valve plug. Secure
with the retaining ring (key 10).