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KMB 18 & 28 MANUAL
5.6 DEMAND REGULATOR
INTERNAL ADJUSTMENT WITH OR
WITHOUT SPECIAL TOOLS
Tools Required:
Small flat blade screwdriver
Needle nose pliers
KMDSI Regulator Tool Kit, Part # 525-620
1. Remove the regulator clamp (50), leaving the
cover (51b) and diaphragm (52)on the regulator.
2) Adjust the regulator adjustment knob all the
way in. Finger tight only.
3) Pressurize the regulator to between 120-150
psig (8.5-10 bar).
4) Holding the cover (51b) in place, slowly back
out on the adjustment knob until a slight free flow
is heard and then rotate the adjustment knob in
(clockwise) 1/4 turn and depress the purge button
momentarily. Repeat this procedure until the
regulator gas flow stops. Usually the regulator
adjustment knob will end up between 5 and 7
turns out when the free flow stops. Note: If when
backing the adjustment knob out from the full
"in" position, the regulator starts free flowing
at less than five turns, this usually indicates
there is not enough free play in the lever.
5) Upon completion of step 4. The demand lever
(55) should have between 1/16 - 1/8 inch (1.5 -
3.0mm) play. If adjustment is necessary, adjust
using the KMDSI regulator adjustment tools if
available or use the alternative method.
Fig. 5.22 Checking the play in the lever.
page 48
© Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 010518001
6) KMDSI tools: Using the inlet valveholding rod,
(L shaped rod), insert the end of the rod into into the
balance hole as shown in Fig 5.23. Lightly apply
force by pushing on the rod making it act as a lever
to put friction against the inlet valve shaft. At this
point, the KMDSI wrench can be used to rotate the
lever nut (53). Rotate the nut "In" (clockwise) to
reduce lever play or "Out" (counterclockwise) to
increase lever play. Only rotate the nut 1/8 turn at
a time as this is a very sensitive adjustment. Re-
move the tools and depress the lever several times
after adjusting to ensure the correct play is achieved.
It may be necessary to repeat this procedure several
times, as the method requires estimating the correct
position of the nut. (Note: If there is little (less than
1/16 inch 1.5mm) or no lever play, the regulator
will free flow. If there is too much free play, (more
than 1/8 inch (3.0mm) the regulator will not be
capable of full demand flow potential.
Fig. 5.23 Using the KMDSI Regulator Adjustment tools.
Alternative method: If a KMDSI tool kit is not
available, a small jewelers screwdriver or metal
scribe can be inserted in the slot on the end of the
inlet valve (59) to keep it from rotating, and then
needle nose pliers may be used to rotate the lever
nut (53). Adjust as described in step 5.
7. When adjustment is complete, place the dia-
phragm (52) and cover (51) in place, and press
tightly down on the cover to simulate the action of
the clamp.
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