User Manual

IOM-CA5/SA5
4
e. Remove plug assembly and 3/8" bar stock
pieces from vise and rotate end for end
and secure in vise again.
f. Using an allen wrench, rotate screw (34)
CCW and remove screw, disc washer (32)
and seat disc (31).
g. Clean all metal parts to be reused ac-
cording to owner's procedures. NOTE:
Regulators are originally supplied with a
level of clean li ness equal to Cashco clean-
ing standard #S-1662. Contact factory for
details.
D. Inspection of Parts:
1. Remove and dis card the fol low ing parts:
diaphragm(s) (9), o-ring (15), seals (21, 27,
28). These parts MUST be re placed with
fac to ry supplied new parts.
2. Inspect the metal parts that will be reused. The
parts should be free of surface con tam i nants,
burrs, oxides, and scale. Rework and clean
the parts as necessary. Surface con di tions
that affect the regulator performance are stated
below; re place parts that can not be re worked
or cleaned.
3. QC Requirements:
a. Valve plug (20);
1. 16 rms fi nish on its seating surface
for tight shutoff.
b. Cage (19);
1. 16 rms fi nish on cage bore. No “ledg-
es” formed due to wear from moving
dynamic side seal (27) or plug (20).
E. Reassembly of the ITA:
1. Secure plug (20) in a vise with seat end up
using the steel bar stock pieces from C. 1.
previous.
2. Place new seat disc (31) and washer (32) over
end of plug (20).
3. Thread screw (34) into plug and torque to
20 - 35 ft-lbs (27 - 47 Nm).
4. Remove plug assembly and 3/8" bar stock
pieces from vise and rotate end for end and
secure in vise, again using the bar stock pieces.
b. Using a special double-posted spanner
wrench fi tting (to order see NOTE in
Section IX, Parts Ordering Information),
turn the pis ton-guide bear ing (13) CCW
to loosen. The piston-guide bear ing (13)
may be re moved by hand after loos en ing.
c. Remove shim (16).
d. Remove and examine the dynamic seal
(27.1, 27.2, 27.3) to de ter mine if sig nifi -
cant leakage was oc cur ring. If the seal
(27) shows signs of leakage, de ter mine
if op er at ing con di tions ex ceed pres sure,
pres sure drop, or tem per a ture lim its.
NOTE:
Special care should be taken
when using “tools” to remove the plug
and seal to ensure that no scratches
are made to any portion of the plug (20)
groove or plug itself.
Figure 2: Assembled ITA, with
"UC" Dynamic Side Seal
10. Remove the ITA from the cage pull ing up on
the piston-guide bearing (13). Set ITA aside.
11. Remove cage (19), o-ring seals (15) and (21).
12. Clean all metal parts to be reused according to
owner's procedures. NOTE: Regulators are
originally supplied with a level of clean li ness
equal to Cashco cleaning standard #S-1662.
Contact factory for details.
C. Disassembly of the ITA:
1. To Disassemble the ITA (See Figure 2):
a. Fit 2 pieces of 3/8" wide x 3" long square
steel bar stock into the fl ats on either
side of the plug and secure snug in the
vise with the lower part (seat end) of the
valve plug (20) down. Do not clamp on
any ma chined, cylindical sur face on the
plug.