Cashco 987 - Manual (Page 9)

9 IOM-987
in di ca ting washer (16) as the ref er ence point.
Adjust indicator plate as needed.
10. Increase pressure in the actuator until the
indicating washer (16) is in alignment with
the "O" mark on the indicator plate.
11. To limit the up travel at the desired stroke
length, rotate the travel stop nut (52) CW
and secure to bottom of the attachment hub
(4). NOTE: Secure the actuator stem (6) by
the fl ats when rotating the travel stop nut.
NOTE: “Stroke” length is in di cat ed on the
name plate (40), and is the dis tance be tween
the “C” and “O” marks of the indicator plate
(23).
NOTE: The proper calibration of the ac tu a tor/
valve unit will occur when at the lower pres-
sure level of bench setting, the valve plug (4)
will just begin to travel from the "C" po si tion.
At the upper level of the bench set, the ac-
tuator pressure should be within ± 8% of the
upper bench setting for the designed stroke
length.
12. Release all pres sure from actuator.
C. Procedure - Direct Action, ATC-FO:
1. Reference the nameplate (40) attached to
the actuator yoke (3). Determine the bench
set ting of the installed range springs (10) from
the nameplate (40); i.e. 5-15 psig (.34-1.0
Barg), or 15-60 psig (1.-4.1 Barg).
2. Connect a temporary air supply with an in-line
ad just able airset regulator and gauge to the
upper actuator con nec tion. See Section IV.
A. 6. for appropriate supply pressure. DO
NOT LOAD with any air pressure at this point.
3. To determine when stem/plug (4) makes
contact with the seat and travel stops, touch
the stem above the packing studs with one
fi nger. (Stem movement will stop when the
plug engages the seat.)
4. Slowly pressurize the ac tu a tor to a pres sure
equal to the upper pres sure lev el of the bench
setting; i.e. for a 5-15 psig (.34 -1.0 Barg)
range, set pressure at 15 psig (1.0 Barg).
Take note of the pressure reading when
stem travel stops.
5. If the loading pressure, when the stem move-
ment stops, is below the upper end of the
desired bench setting, then the com bined
stem (4, 6) length is too long.
a. Rotate both jam nuts (17) down to base of
threads on stem (4) and tighten together.
b. Decrease pressure in actuator to approxi-
mately mid range of the bench setting.
c. Rotate lower jam nut CCW to shorten the
combined stem length. DO NOT allow
actuator stem (6) to rotate in the actuator.
d. Rotate upper jam nut CW to hold indicat-
ing washer (16) up against stem (6).
e. Release all pressure from the actuator
and repeat Step 4 previous.
6. If the loading pressure when the stem move-
ment stops is above the upper end of the
desired bench setting, then the com bined
stem (4, 6) length is too short.
a. Rotate both jam nuts (17) down to
base of threads on stem (4) and tighten
together.
b. Decrease pressure in the actuator to
approximately mid range of the bench
setting.
c. Rotate upper jam nut CW to increase the
combined stem length. DO NOT allow
actuator stem (6) to rotate in the actuator.
d. Rotate upper jam nut CCW to hold indi-
cating washer (16) up against stem (6).
e. Release all pressure from the actuator
and repeat Step 4 previous.
7. After the closed set point pressure has been
established, rotate lower jam nut (17) CCW
up tight under the upper jam nut.
8. Increase pressure in the actuator to the upper
pressure level of the bench setting.
9. Observe the location of the in di ca ting washer
(16) to the "C" mark on the in di ca tor plate
(23), mak ing sure to use the “top edge” of
the in di ca ting washer (16) as the ref er ence
point. Adjust indicator plate as needed.
10. Decrease pressure in the actuator until the
indicating washer (16) is in alignment with the
"O" mark on the indicator plate.
11. To limit the up travel at the desired stroke
length, rotate travel stop nut (52) CW and
secure to bottom of attachment hub (4).
NOTE: Secure the actuator stem (6) by the
fl ats when rotating the travel stop nut.
NOTE: “Stroke” length is in di cat ed on the
name plate (40), and is the dis tance be tween
the “C” and “O” marks of the indicator plate.