IOM-ALR-1
10
but ton (5) onto range spring (6); en sure
spring button (5) is laying flat.
14. Rotate the spring chamber (2) CW by hand
into the threaded portion of the body (1) as-
sur ing not to cross thread. Continue hand
ro tat ing CW until firmly seated against
the di a phragm stop (9). Wrench tight en
se cure ly to 20 - 25 Ft-lbs. (27 - 34 N-m)
15. Reinstall ad
just ing screw (3) with locknut
(4) into the spring chamber (2).
16. Pressurize with air and spray liquid leak
de tec tor to inspect entire body (1) and
spring cham ber (2) for leakage. En sure
that an inlet pres sure is main tained dur ing
this leak test of at least mid-range spring
level; i.e. 40-90 psig (2.8-6.2 Barg) range
spring, 65 psig (4.5 Barg) test pres sure
min i mum.
L. Trim Replacement
1. Trim inspection requires the diaphragm
sub as sem bly be removed. Refer to previ-
ous pro ce dure, Sec tion VI.K.
2. Inspect inside surface of seat ring (15)
and seating surface of plug (14). If seat-
ing surface shows signs of erosion/wear,
the seat ring (15) and plug (14) should be
replaced.
3. Clean body (1) cavity. Clean all parts to be
reused.
NOTE:
On regulators originally
sup plied as “oxygen clean”, Option -55,
main te nance must include a lev el of clean-
li ness equal to Cashco's clean ing stan dard
#S-1134. Contact factory for de tails.
4. Inspect the surface in the body (1) cavity
where seat ring (15) rests. If surface area
of either mating part shows signs of ero-
sion/wear, re place with new regulator.
5. Place seat ring (15) in center of body (1)
cavity. Ensure that the shoulder on outer
edge of seat ring (15) faces up towards the
di a phragm (11).
6. Reinstall diaphragm subassembly per
Sec tion VI.K steps 10 thru 16.
7. Bench test unit for suitable operation.
NOTE:
Reg u la tors are not tight shut off
devices. Even if pressure falls below set-
point, a reg u la tor may or may not develop
bubble tight shut off.
8. Pressurize with air and spray liquid leak
de tec tor to inspect entire body (1) and
spring cham ber (2) for leakage. Test pres-
sure should be the max i mum allowed by the
range spring at the inlet.
