Cashco SCV-S - Manual (Page 5)

5 IOM-SCV-S
Place new seat disc on threaded end of
plug and re-install in nut. Place stem on
threaded end of plug and secure tight.
Special care must be exhibited when
ro tat ing the stem to not mar that por-
tion of the surface of the stem where
it contacts with the seal o-rings (9).
Inspect the body (1) seating surface. If
seating surface shows wear, re place the
body.
2. Pick up bonnet (2) and using a thin-edged
tool, remove both upper and lower stem seal
rings (9) and discard used seal rings.
3. Clean all parts per owner’s pro ce dures. A fi nal
rinse with ultra-clean water is rec om mend ed.
6. Release temporary air pressure.
7. Lift actuator assembly (AA) up wards until able
to swing out of the way and set down onto
work surface.
D. Body Disassembly:
1. Remove actuator assembly (AA) per Sec tion
V.B.1-6 or V.C.1-7.
2. Remove clamp nuts (4.3), wash ers (4.4), bolts
(4.2), and clamps (4.1).
Figure 3 : Clamp Orientation
4.1
4.2
4.3
4.4
4.1
CAUTION
CAUTION
Owner’s cleaning solution must be com pat i ble with control
valve’s trim ma te ri als.
Do not use any sharp-edged tool to install the lower and
upper stem seal rings (9).
3. Hold stem (3,10) securely, pull up wards, lifting
bonnet (2) away from body (1).
4. Slide bonnet (2) up over end of plug/stem
(3,10) and set both aside.
5. Remove gasket (7) from body (1) -to-bonnet
(2) joint. Discard gasket (7).
E. Trim Inspection and Replacement:
1. Inspect body (1), bonnet (2) and stem plug (3)
or seat disc (13) for wear. If seating surfaces
show signs of wear, proceed as follows:
a. For metal seated plug construction, place
lap ping com pound on seat ing sur fac es,
re as sem ble body as sem bly (BA), and
hand-lap the plug/stem (3) to re move
minor seat wear. If hand-lapped, both
the body (1) and plug/stem (3) head will
re quire care ful me chan i cal pol ish ing and
me chan i cal buffi ng; chemical electro-
pol ish ing may be required.
b. For composition seated con struc tion,
secure stem/plug assembly (10) in a
soft-jawed vise (plug end down) using the
fl ats on the nut (12). Rotate stem CCW to
remove. Insert fl at blade screwdriver into
the slot in the end of the plug and rotate
CW to remove plug (15) and seat disc(13).
F. Body Reassembly:
1. Place body (1) into vise ori ent ed for vertical
plug/stem position.
2. Place new gasket (7) onto body (1) fl ange.
3. Lubricate O.D. of stem seals (9) and carefully
insert new spring-as sist ed stem seal rings (9)
back into the bon net’s (2) grooves. "Open"
face of both seal rings oriented downwards
towards the plug head. (Detail "A")
4. Lubricate I.D. of stem seals (9). Insert the up-
per end of the stem (3,10) through the bon net
(2) and thru both stem seal rings (9).
5. Set bonnet (2) with inserted plug/stem onto the
fl ange of the body (1). Lower plug/stem until
it touch es the body seat. Press down fi rmly
on the stem (3, 10) up per end.
6. Re-position clamps (4.1), bolts (4.2), wash-
ers (4.4), and nuts (4.3) around the body (1)
to-bonnet (2) joint. Rotate clamp nuts (4.3)
a few revolutions in an alternating pattern
to hold clamp assembly Align matchmarks.
Position both hands around the outside of the
Tri-Clamp
® , push the clamp to wards the valve’s
center. Ensure proper alignment of body (1)