Cashco SCV-S - Manual (Page 4)

IOM-SCV-S 4
from the plug/stem (3), while holding the
actuator stem (6). Record the num ber of
plug/stem rev o lu tions for Step A above.
When the dis en gage ment reach es about
50% of full stroke trav el Step A is com-
plet ed. (Note RP).
c. Step B. Support the actuator as sem-
bly (AA) from above. Fully loosen
yoke nut (8). Lift the actuator as-
sem bly (AA) up wards ap prox i mate ly
1/4"-3/8" (6-8 mm). Again, rotate plug/
stem (3) CW (viewed from above) to
dis en gage the ac tu a tor stem (6) from the
plug/stem (3) while holding the ac tu a tor
stem (6). Record the number of plug/stem
rev o lu tions for Step B above. This should
allow the stems (6) (3) to fully dis en gage.
NOTE: Take notice of the parts “dan gling
loosely” about the stem (3), the order of their
lo ca tion and their proper orientation.
d. Fully raise the actuator assembly (AA)
from the valve body assembly (BA).
Re move cautiously to prevent dan gling
parts - indicating washer (16), ac ces so ry
plate ((AP)), yoke nut (8) - from fall ing.
6. For ATC-FO Direct Action Units:
a. Step A. Rotate plug/stem (3) CW (viewed
from above) to disengage the ac tu a tor
stem (6). Do not rotate the plug (3) into
the seat (11). Record the number of
stem (3) rev o lu tions for Step A. When
the dis en gage ment reach es about 75%
of full stroke travel, Step A. is com plet ed.
b. Step B. Support the actuator as sem bly
(AA) from above. Fully loosen yoke nut
(8) and remove. Lift the actuator as sem-
bly (AA) upwards ap prox i mate ly 1/4" -
3/8" (6-8 mm). Again, rotate plug/stem
(3) CW (viewed from above) to dis en gage
the ac tu a tor stem (6) from the plug/stem,
while holding the actuator stem. Record
the number of plug/stem rev o lu tions for
Step B. This should allow the stems (6)
(3) to fully disengage.
NOTE: Take notice of the parts “dangling
loosely” about the stem (3), the order of their
lo ca tion and their proper orientation.
c. Fully raise actuator assembly (AA) from
the valve body assembly (BA). Re move
cau tious ly to prevent dan gling parts –
indicating washer (16), ac ces so ry plate
((AP)), yoke nut (8) - from falling.
C. Separation of Body/Actuator with Opt-68 Quick
Disconnect Stem:
1. Place body assembly (BA) into a vise with
the actuator as sem bly (AA) in the upwards
position.
2. Place matchmarks between the yoke (3),
bonnet (2), Tri-Clamp ® (4), and body (1) to
assist during re-assembly.
3. Using an overhead hoist, rig the actuator as-
sem bly (AA) for a vertical lift. Remove slack
from rigging.
4. Rotate yoke nut (8), (turning CCW viewed
from above actuator) until fully dis-engaged.
For ATO-FC (Reverse) Action Units Only:
Connect a temporary air supply hose that has an
ad just able airset with gauge to the ac tu a tor inlet
to allow pres sur iza tion. Pressurize the actuator
to upper limit of the bench range specifi ed on the
name plate (40). (NOTE: Pressure will lift the plug/
stem (10) away from the body's (1) integral seat
until the plug is 100% open.).
Figure 2: Opt.-68 Quick Disconnect
42a
42b
10
5. The valve stem (10)-to-actuator stem (6)
assembly is a quick disconnect joint. Grasp
stem (10) between thumb and fore fi n ger of one
hand. Grasp the lower collar (42b) between
the thumb and fore fi n ger of the other hand.
Slide/push lower collar (42b) upwards. Stems
(10) and (6) should uncouple and separate.
NOTE: Take care to not “drop” the plug/stem
(10) down wards into the body’s (1) integral seat;
lower slow ly to this po si tion.
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