© ⅯⅯⅩⅢ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318002
79
Kirby Morgan
®
37SS
Chapter 7 - Defogger Valve
B
WARNING
If silicone sealant is blocking the air
flow into the mask it must be cleaned
out. If it is not cleaned out, the diver
may not be able to properly defog the
mask or clear a flooded mask quickly.
In addition, if the demand regulator is
not delivering air properly, the diver
cannot use the free flow system as
a source of breathing air. This could
lead to suffocation.
2) Before installing the air train into the helmet, make
sure the screw spacer is properly and fully inserted.
It is sometimes easier to install the large sleeve over
the stud after the air train body is installed.
3) Install the air train body into its proper position
inside the helmet shell. The stud on the side block
penetrates the larger hole in the air train body.
Install the air train and air train body inside the helmet.
4) Thread the screw through the spacer and through
the air train body and helmet shell and lightly tighten
into the side block body.
5) Install the large sleeve onto the stud. Slide the flat
washer and the lock washer onto the stud. Run the
stud nut down the stud and tighten. Tighten to 35
inch pounds (4 Newton meters).
DO NOT OVER-
TIGHTEN.
Install the sideblock on the helmet shell.
6) Tighten the screw to the correct torque, 20 inch
pounds (2.25 Newton meters).
7) Clean off all excess silicone sealant.
8) Test the side block prior to diving to ensure that no
silicone sealant is blocking the air flow to the mask.
If it is, it must be cleaned out prior to diving.
B
WARNING
Do not dive the helmet until the seal-
ant has had time to cure. Check the
directions on the tube of sealant for
curing time. If the mask goes into the
water before the sealant has cured
it could leak through the side block
mounting stud hole, screw hole, or air
flow hole. This could lead to drowning.
7.5 Defogger Valve
7.5.1 Disassembly of the Defogger Valve
Tools Required:
Soft Jaw Vise
¼ inch Slotted Flat Blade Screwdriver
Torque Wrench with
13/16
inch Open End Attachment
The defogger valve (also referred to as free-flow or
steady-flow) components are disassembled as fol
-
lows: