Cashco SCV-30 - Manual (Page 5)

5 IOM-SCV-30
Lower actuator as sem bly (AA) down and over
valve stem (3.1), so the upper end of the valve
stem (3.1) passes thru lower opening of the
yoke (3) and thru yoke nut (8).
For ATO-FC Reverse Action Units:
Connect a temporary air supply hose that has
an ad just able airset with gauge to the actuator
and pressurize the actuator to upper limit of the
bench range specifi ed on the name plate (40).
For ATC-FO Direct Action Units:
Not necessary to connect temporary air supply.
3. Continue to lower actuator assembly until
it rest on the bonnet (2). Align actuator as-
sembly (AA) and body assembly (BA) with
matchmarks of V.B.2 pre vi ous. Place yoke
nut (8) onto bonnet threads and hand tighten.
4. Grasp plug/stem (3.1) between thumb and
forefi nger of one hand. Grasp lower collar
(42b) be tween thumb and forefi nger of the
oth er hand. Lift plug/stem (3.1) up and into the
opening of the lower collar (42b). Slide/push
the collar (42b) upwards while si mul ta neous ly
lifting the plug/stem (3.1) end into the quick
disconnect (42) as sem bly. A “click” will be
felt when the engagement is prop er; release
the collar (42b). The lower lips of the collar
(42b) and the ac tu a tor stem (6) assembly
should align. Re lease the plug/stem (3.1) to
en sure en gage ment. NOTE: For ATO-FC
Action may need to slowly decrease actuator
pressure to allow stem and collar to engage.
5. Tighten yoke nut (8) to 85 ft-# (115 N M).
For ATO-FC Reverse Action Units:
Release all pressure from the actuator.
VI. CALIBRATION
A. General:
1. This section only covers cal i bra tion of the
control valve with Actuator Model C27-C53.
2. Positioner, if in stalled, requires ref er ence to
the spe cifi c positioner mod el IOM for prop er
cal i bra tion pro ce dure.
13. After proper cure, remove temporary weight
and plug/diaphragm sub-assembly (3) from
the body (1). Remove body (1) from vise.
14. Reclean body(1), plug/diaphragm sub-
assembly (3), bonnet (2), and “Tri-Clamp” sub-
assembly (4) per owner's procedures. A fi nal
rinse with ultra-clean water is rec om mend ed.
E. Body Reassembly:
1. Place body (1) back into vise ori ent ed for
vertical plug/stem (3.1).
2. Set plug/diaphragm sub-assembly (3) back
into body (1) cavity, aligning the tab of the
diaphragm (3.2) to be located into the slot of
the body (1) fl ange.
3. Insert upper end of the plug/stem (3.1) through
the bon net (2) as bonnet (2) is lowered over
stem (3.1) and down onto fl ange of body (1)
and diaphragm (3.2).
4. Press down fi rmly on the plug/stem (3.1) up-
per end.
5. Re-position "Tri-Clamp" assembly (4) around
the body (1) to-bonnet (2) joint. Align match-
marks. Latch wing nut back into slot. Rotate
wing nut CW and tighten with approximately
4 - 6 ft.- # (5-8 N M) torque.
6. Reinstall actuator assembly (AA) to body as-
sembly (BA) per Section V.F.
F. Mounting - Actuator Assembly to Body:
1. Place body into a vise securely with the plug/
stem (3.1) directed upwards.
2. Using an overhead hoist, rig and lift actuator
assembly (AA) above body assembly (BA).
3. All indicated items numbers that are with
re spect to IOM-C27-C53 will be in pa ren-
the sis and un der scored; i.e. (20); those that
reference the po si tion er IOM will be in double
paranthesis; i.e. ((AP)). All item numbers that
are with respect to this IOM-SCV-S are not
un der scored; i.e. (3).
SECTION VI