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SuperLite
®
17B
© ⅯⅯⅩⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 120613005
73
6) Inspect the emergency gas valve knob for wear and
damage. Ensure the flats that engage the valve stem shaft
are not rounded, cracked or damaged. The valve knob
should not have rotational play greater than
1/16
of a turn.
NOTE: This knob is not interchangeable with the
defogger valve knob.
7) Place the emergency gas valve knob onto the stem
and rotate the stem all the way out, then back again.
The rotation must be smooth. If “hard spots” or un
-
evenness are felt during the rotation, the stem may be
bent and could need replacement.
8) Tighten the packing nut with a torque wrench until
moderate resistance is felt when turning the knob.
Torque to 50 inch pounds after seating.
9) Place the spring, and locknut onto the stem secur
-
ing the knob.
10) Tighten the locknut until its top is flush with the
top of the knob. The assembly is now complete and
ready for testing.
NOTE: At this time, with the valve separated from
the sideblock, testing of the emergency gas valve is
easily accomplished by attaching the valve, by itself
in the shut position, on to the bail-out whip from the
first stage. Pressurized to a minimum 135 p.s.i.g. (9.3
bar) using the EGS Cylinder and dropping it into a
bucket of clean water a minimum 30 seconds to check
for leaks.
A leaking Emergency Gas Valve as-
sembly can cause the diver to exhaust
their entire EGS (bailout) without their
knowledge. This may lead the diver to
mistakenly assume their EGS supply is
available when it is not. This could lead
to panic or drowning in an emergency.
Any worn or damaged components must
be replaced.
A submersible pressure gauge
should always be used with the EGS
system to help minimize this risk.
WARNING
11) Before wrapping the threads with pipe tape, check
the fit of the valve assembly pipe threads to the mating
threads of the side block. There should be 2 turns of
hand make up before needing to use a wrench.
If there is less make up, call your nearest KMDSI dealer
or Dive Lab for advice.
12) Before installing the valve assembly, wrap the pipe
threads with 1 ½ turns of Teflon
®
tape starting after the
first thread. Apply the tape with slight tension to allow
the tape to fill into the threads.
Hand tighten the valve, then continue an additional 1
½ to 2 turns with a wrench keeping in mind the proper
alignment of the control knob to the side block. Also,
there should be at least one male thread visible. Check
to be certain the valve is tight by trying to loosen the
fit by hand.
DO NOT TIGHTEN
THE VALVE BODY TIGHTER
THAN NECESSARY! OVER TIGHTENING MAY
OVERSTRESS THE PART AND CAUSE THE PART
TO FAIL.
It is NOT necessary to have the control knob for the
emergency gas supply valve perfectly “square,” i.e., at
a 90 degree angle to the side block. Any angle is ac
-
ceptable provided that 1) the valve handle can be turned
easily and 2) the diver can locate the handle easily.
7.5.4 Leak Testing the EGS Valve
1) Attach supply whip from the EGS first stage to EGS
helmet valve.
2) Ensure the defogger valve knob is open and the EGS
Valve is shut.
The control knob for the emergency valve
and the defogger knob are not inter-
changeable. Use only the correct knob
for the appropriate valve.
WARNING
Use only thin Teflon
®
tape when installing
the Emergency Gas Supply valve in the
side block. Thick tape can lead to thread
damage, which may make it impossible
to install the EGS valve in the side block
properly. This could lead to a loss of
breathing gas.
WARNING