Cashco 1000 HP Basic - Manual (Page 6)

6 IOM-1000HP-Basic
NOTE: Never replace bolting (8 and 9) with just any bolting if
lost. Bolt heads and nuts are marked with spec i fi ca tion iden ti-
fi ca tion num bers. Use only proper grades as re placements.
25. Reinstall adjusting screw (6) with locknut
(7); install closing cap (31) if provided.
26. Soap solution test around bolting (8 and 9),
body (1), spring chamber (2) fl anges, and
cyl in der (21)-to-body (1) joint for leak age.
Ensure that an outlet pressure is main tained
during this leak test of at least mid-range
spring level; i.e. 10-40 psig (0.7-2.75 Barg)
range spring, 25 psig (1.75 Barg) test pres-
sure min i mum. Use 100 psig (7.0 Barg)
min i mum inlet pres sure to leak test. Actual
service con ditions should be used if in ex cess
of the minimum con di tions.
C. Special Instructions for Diaphragm
Removal.
1. If Option 1000-3, Handwheel or Tee-bar, is
uti lized, the adjusting screw (6) and locknut
(7) are replaced re spec tive ly by handwheel/
tee-bar adjusting screw (6) and locking le ver
(7).
2. Use only gaskets of the same material as
those originally utilized. Cashco's Option
1000-45, non-asbestos construction, uti liz es
spe cial gas kets.
D. Diaphragm Setting Adjustment:
1. In the previous “Sub-Section B. Diaph ragm
Replace ment”, care was taken to prevent
re mov al of the stud collar (16) and stud nut
(10). Location of the stud nut (10) is a critical
ad just ment for a Model 1000 regulator.
2. Not removing the stud nut (10) will provide
per for mance equal to original factory per for-
m ance when a diaphragm(s) (20) is re placed
with a like diaphragm(s) (20). How ever, if the
stud nut (10) is removed, or a switch is made
from metal to composition diaphragm (20), or
vice versa, the dia phragm setting should be
checked.
3. Follow procedure “Sub-Section B. Dia phragm
Re place ment” to the point of re mov ing
diaphragm(s) (20), Step 14. Remove di a-
phragm gasket (19) and pusher plate stud
gas ket (12). Obtain a fl at 12" x 1-1/2" x 1/4"
(300 mm x 40 mm x 6 mm) plate bar with a
3/4" (20 mm) hole drilled in the center. Hook
the pusher plate stud (13) into the rocker arm
(14) prongs prop er ly. Pull fi rmly up on the
pusher plate stud (13) to ensure that all slack
is re moved from the mech a nism and that the
piston (24) is seat ed fi rmly. Relax the pulling
and place the fl at bar over the pusher plate
stud (13) with the stud (13) passing through
the hole of the bar. Again, pull fi rmly up to
remove mech a nism slack. One of three posi-
tions will be reached:
a. Diaphragm setting too high. Pusher plate
stud (13) will lift the fl at bar over 0.020"
(0.50 mm).
b. Diaphragm setting acceptable. Bar lift ed
be tween 0.010"-0.020" (0.25-0.50 mm).
c. Diaphragm setting too low. Bar lifted less
than 0.010" (0.25 mm), or failed to be
lifted.
4. The castle style stud nut (10) has six lo ca tions
per revolution to align the stud nut (10) slots
with the drilled hole through the pusher plate
stud (13). Each stud nut (10) slot represents
a movement up/down of 0.010" (0.25 mm).
NOTE: The ideal diaphragm set ting is 0.015"
(0.38 mm) high, and better per for mance
is usu al ly obtained when the di a phragm is
slight ly higher rather than low er. As the mea-
suring of thousandths of an inch is dif fi cult with
such a procedure, it is rec om mended that the
“null” position be found where the di a phragm
(20) is fl ush with the body (1) fl ange (bar ap-
prox i mate ly at 0.000" (0.00 mm)). Remove
the push er plate stud (13), rotate the stud nut
(10) one or two slots CCW to bring the setting
to 0.010"-0.020" (0.25-0.50 mm) high.
Checking diaphragm setting.