IOM-ALR-1
9
I. UnLoader
Disassembly:
WARNING
SYSTEM UN DER PRES SURE. Prior to performing
any maintenance, isolate the reg u la tor from the
system and relieve all pres sure. Failure to do so
could result in personal injury.
J. General:
1. Maintenance procedures hereinafter are
based upon removal of the regulator unit from
the pipe line where installed.
2. Owner should refer to owner's procedures for
removal, handling, cleaning and disposal of
nonreusable parts, i.e. gaskets, etc.
3. Refer to Unloader drawing for item numbers.
4. Remove Unloader from piping.
K. Diaphragm Replacement
1. Securely install the body (1) in a vise with the
spring chamber (2) directed upwards.
CAUTION
To prevent damage to body, use lead jaws when
placing body in a vise. Position so that vise closes
over inlet and outlet of the body.
2. Relax range spring (6) by loosening the lock-
nut (4) and turning ad just ing screw (3) CCW
until re moved from spring cham ber (2).
3. Loosen spring chamber (2) by placing
wrench on “flats” and rotating CCW.
4. Remove spring chamber (2), spring button
(5) range spring (6), and travel stop (9).
5. Remove the diaphragm subassembly con-
sist ing of the pressure plate nut (7), lock
wash er (8), pressure plate (10), diaphragm
SPRING UNDER COMPRESSION. Prior to
re mov ing spring chamber, relieve spring
compression by back ing out the ad just ing screw.
Failure to do so may result in flying parts that
could cause personal injury.
WARNING
(11), plug gasket (13) and plug (14).
NOTE:
Refer to the quan tity of dia phragms (11)
in cor po rated per the bill of ma te ri als listing.
De pend ing on inlet pressure level, multiple
metal diaph ragms (11) may be “stacked”
.
Diaphragm Sub as sem bly
8
11
13
7
10
14
6. Loosen pressure plate nut (7) and sep a rate
all parts (7, 8, 10, 11, 13 & 14) of the di a-
phragm sub as sem bly.
7. Inspect pressure plate (10) to ensure no
de for ma tion due to over-pressurization. If
de formed, re place.
8. Remove diaphragm gasket (12).
9. Clean body (1) and di a phragm flange. NOTE:
On reg u la tors origi nally sup plied as “oxygen
clean”, Option -55, main tenance must in-
clude a level of clean li ness equal to Cash co's
clean ing stan dard #S-1134. Con tact fac to ry
for de tails.
10. Reassemble diaphragm subassembly by
plac ing plug gasket (13), diaphragm(s) (11),
pres sure plate (10) and lock washer (8) over
thread ed post of plug (14). En sure the pres-
sure plate (10) is placed with curved outer rim
down next to the di a phragm (11) surface.
Place a thread seal ant com pound similar to
Loctite #271 on the threads of the plug's (14)
post prior to tightening the pressure plate nut
(7) to 60 In-lbs. (6.8 N-m).
11. Place diaphragm gasket (12) on body (1),
then in sert the di a phragm sub as sem bly into
the body (1).
12. Place travel stop (9) and range spring (6) over
the pres sure plate nut (7) of the di a phragm
sub as sem bly.
13. Place multi-purpose, high temperature
grease into de pres sion of spring button (5)
where ad just ing screw (3) bears. Set spring
