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SuperLite
®
17B
© ⅯⅯⅩⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 120613005
13
When diving in heavy current (i.e. exceed
-
ing 3 knots) the single exhaust system
on all KMDSI masks/helmets could allow
water to enter, due to turbulence/eddy
-
ing. It is important for the user/diver to
take excessive currents into consider-
ation. The Quad-Valve™ Exhaust system
will help prevent water intrusion when
diving in heavy currents. Unlike the old
double exhaust, the Quad-Valve™ does
not limit the diving depth.
CAUTION
The Quad-Valve™ exhaust system is now standard
equipment for the SL 17. This superior exhaust sys-
tem has exceptionally low exhalation resistance, and
helps to keep the helmet free of contaminants in pol-
luted water. The Quad-Valve™ isolates the breathing
system from the surrounding water with a four valve,
low breathing resistance design (Patents Pending).
The Quad-Valve™ is designed to couple the regulator
exhaust with the helmet main exhaust and route them
into a single plenum chamber, mounted between the
regulator body and main exhaust body. The exhaust
gas then must pass through either one of two (or both)
exhaust valves that are part of the bubble deflector
(whisker wing). By having an exhaust valve in both
sides of the bubble deflector, exhalation resistance is
minimized, while still helping to maintain the isola-
tion of the main helmet and regulator exhaust valves.
Other helmet features which are common to all
KMDSI helmets include:
• the face port and retainer ring
• basic communications components
• the oral nasal mask
• the nose block device
• the air train
• most demand regulator components
Many of the breathing system components on these
helmets are also compatible with the KMB 18B and
28B. This helps reduce the inventory of spare parts
that must be carried by commercial diving compa-
nies.
Each step of the manufacturing process is carefully
controlled to assure the customer of a high quality,
durable helmet that will function properly. The fol-
lowing is a general description of the features of the
SL 17.
1) The fiberglass shell face port (or view port) area
remains unchanged. The side block and bent tube
assembly that transports air/gas to the demand regu-
lator from the side block are also the same. Most of
the components in these areas are interchangeable
between the 17B and models 27, 37, 47, and 57.
2) The neck dam on the SL 17 is secured by the neck
clamp. Replacement neck dams install easily.
3) The head cushion attaches just inside the bottom
of the helmet, keeping it in place when the diver
dons the hat. The standard head cushion consists
of a brushed nylon bag with an open cel polyester
foam inside. Only genuine Kirby Morgan SL 17 head
cushions should be used to ensure proper operation
and comfort.
4) The handle that is fitted to the top of the SL 17 and
the port weight are areas that can be used as mounting
brackets for lights, TV cameras, etc.
2.8 General Description
2.8.1 Helmet Shell
The helmet shell is fabricated of noncorrosive, rigid
fiberglass which will not carry an electrical charge.
This shell is the central structure for mounting all the
components that make up the complete helmet. It is
designed to allow easy replacement of parts when
necessary. Any repair to the helmet shell must be
done at an approved KMDSI repair center.
2.8.2 Gas Flow Sy
stems
The main gas supply flow from the umbilical enters
the system at the adapter and flows through the one
way valve to the interior of the side block. The one
way valve or “non-return” is a very important com-
ponent.
It prevents the flow of gas out of the helmet to the
umbilical in the event of a sudden lowering of pres-
sure in the supply hose. This can happen due to an
accidental break in the hose or a fitting near the
surface. Not only would the Auxiliary gas be lost if
the one way valve failed (concurrent with a hose or
fitting break on deck), but the diver could suffer from
a serious “squeeze” that could cause injury or death.