Cashco SA1 - Manual (Page 5)

IOM-CA1/SA1 5
seal (27.2) into the groove of the
piston-guide bear ing (13).
NOTE: Use NO lubricants!
2. Position cap seal (27.1) ring with
rect an gu lar cross-section at end of
pis ton-guide bearing (13). Stretch cap
seal over lower end of piston-guide
bear ing (13) us ing thumbs to work the
cap seal onto the piston-guide bear-
ing. DO NOT USE A TOOL FOR THIS
STEP. Con tin ue pressing cap seal
(27.1) up wards towards the groove
until the cap seal “snaps” into the
groove of the piston-guide bear ing.
3. Insert shim (16) into cage (19) and
al low to rest inside the cage.
4. Position piston-guide bearing (13)
over and into upper end of cage (19)
until the cap seal (27.1) edge touch es
the upper lip of the cage. While gently
applying force to press the piston-
guide bearing (13) into the cage (19),
simultaneously use fi n gers to lightly
press the cap seal (27.1) in wards into
the groove of the piston-guide bearing
un til the cap seal “slips into” the cage
(19). DO NOT use tools or lu bri cant
to en gage the cap seal (27.1) into the
cage (19). DO NOT press down ward
on pis ton-guide bearing (13) too hard
or fast - the cap seal (27.1) may slide
out of its groove and become dam-
aged.
b. Type UC:
1. Position u-cup seal (27.3) over low er
circumference of piston-guide bear ing
(13). Ensure the u-cup seal is oriented
with the center-open-down wards as
shown in Fig ure 1, as the u-cup seal
de pends upon the P1-Inlet pressure
to activate prop er seal ing ac tion.
2. Insert shim (16) into cage (19) and
al low to rest inside the cage.
3. Position piston-guide bearing (13)
over and into upper end of cage (19)
until the cap seal (27.1) edge touch es
the upper lip of the cage. Gently apply
downward force to press the pis ton-
guide bearing (13) into the cage (19).
DO NOT use tools, lu bri cant, or heavy
force to en gage the u-cup seal (27.3)
into the cage.
2. Place properly oriented seat ring (21) onto its
shoul der at the lower end of cage (19).
3. Completion of ITA Reassembly.
a. Insert valve plug (20) upwards through
lower end of cage (19) and through the
center hole of shim (16).
b. Engage valve plug (20) with piston-guide
bearing (13) threads and fi nger tighten.
c. Place ITA into a vise with smooth jaws
and grasp at hub "fl ats" location on the
valve plug (20) that is not in the “spindle”
zone. (See Figure 2.)
d. Using a special double-posted spanner
wrench fi tting (to order see NOTE in
Section IX, Parts Ordering In for ma tion),
tighten the piston-guide bear ing (13) to
the valve plug (20) with the following
torque values. Do NOT allow valve plug
(20) to rotate against seat ring (21) during
tight en ing.
e. This completes ITA reassembly.
Body Size Ft-lbs. (Nm)
3/4"-1" 40–50 (54–68)
1-1/2"–2" 70–80 (95–108)
F. Main Regulator Reassembly:
1. Insert the return spring (22) into the body (23).
2. Fit cage O-ring seal (15) into the body (23)
groove.
3. With the ITA held manually in the closed po si-
tion, insert ITA and cage (19) into body (23).
4. Properly align all three cage bolt (18) holes as
there is only one proper alignment possible.
Ap ply a down ward force to the top of the
cage (19) until the ITA is lowered suf fi cient ly
to engage the cage bolts (18) with washers
(17) into the body (23). Engage all of the cage
bolts , then tighten the cage bolts in al ter nat ing
one-half rev o lu tion in cre ments to pull down the
ITA evenly. ENSURE THE ITA DOES NOT
BECOME WEDGED AS IT IS SLID INTO
THE BODY. Tight en the cage bolts (18) to a
torque value of 13-15 Ft-lbs (17.5-20.5 Nm).
5. Units with CTFE or VTFE seat ring (21): Due to
the relative "hardness" of the CTFE and VTFE
material, to obtain the best possible shutoff
it is nec es sary to generate a "coined" seating
chamfer.
6. To coin the seat ring:
a. Close-off the outlet connection.
b. The level of seat leakage can be quan ti-
fi ed at the internal sensing passage.