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© ⅯⅯⅩⅢ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130115001
91
SuperLite
®
27
®
adjustment knob is turned in, the leak may continue.
1) One method to check for this is for the diver to
place the demand regulator above the neck dam by
looking up. Free flow from a leaky neck dam should
cease as long as the helmet is in the upright position.
2) Ensure the demand regulator bias adjustment knob
(98) is properly adjusted for the supply pressure.
3) During ascent the regulator will free flow if the
supply pressure to the helmet is not backed off (top
-
side) or, the diver does not adjust “in” (clockwise),
the demand regulator adjustment knob as the diver’s
depth and the ambient pressure decreases.
4) If the preceding steps were checked and the demand
regulator still steady flows the regulator requires
adjustment.
7.9 Oral Nasal
7.9.1 Oral Nasal Removal
Tools Required:
7/16 inch Open-end Wrench
The oral nasal mask is easily replaced.
1) Remove the nose block device first. See Chapter 8
for this procedure.
2) Remove the microphone.
3) The oral nasal mask can then be pulled off the
regulator mount nut. It is held on by a snap fit.
7.9.2 Inspection of Oral Nasal
1) Inspect the oral nasal mask. If it is torn, damaged
or aged it must be replaced.
2) Inspect the oral nasal valve. If it is torn or damaged
it must be replaced.
3) Remove the valve body by pushing it out of the
oral nasal.
7.8.11 Regulator Has Low or No Flow When
Pressurized
Tools Required:
Regulator Adjustment Tools, (Part #525-620)
1/4 inch Flat Blade Attachment on Torque Screwdriver
NOTE: If there is low or no flow when the regulator
is pressurized, and the lever is very loose (travels
more than 1/8 inch at the roller end), the nut must be
tightened.
1) Adjust demand regulator bias adjustment knob “in”,
i.e., clockwise.
2) Ensure supply pressure is adjusted between 135-150
p.s.i.g. (9.3-10.3 bar).
3) Back the demand regulator bias adjustment knob
(98) out counterclockwise until a slight steady flow
develops. Then adjust the knob in clockwise until the
free-flow just stops. Depress the lever several times
to ensure the regulator is stabilized.
4) Recheck the lever play at the purge button ensuring
1/16 inch (1.5 mm) to l/8 inch (3.0 mm) of free travel
before the purge button comes in contact with the
diaphragm actuating a slight flow of gas. If a slight
flow of gas develops with the purge button depressed
less than 1/16 inch (1.5 mm), the lever will require
slightly more play. If the purge button travels greater
than 1/8 inch (3.0 mm), the lever will require a reduc
-
tion of play by adjusting.
5) Recheck that gas source pressure is set between
135-150 p.s.i.g. The gas source must be capable of
supplying 4.5 a.c.f.m. (127.4 L/min per diver) at the
required over bottom pressures for the depth of the
dive per Section 2, Tables 1 and 2.
6) If the preceding steps were satisfactory, check the
following helmet/mask parts for foreign debris in the
air/gas passages:
a. One-way valve
b. Side block assembly
1. Defogger valve
2. Emergency Valve Assembly
3. Bent Tube Assembly
7.8.12 Unexplained Demand Regulator Free
Flow
Any leak in the neck dam when the diver is face down
will cause gas to vent out into the water from the inside
of the helmet. This causes the demand regulator to
steady flow, making up for the vented gas. Even if the