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7.5 Defogger Valve
7.5.1 Disassembly of the Defogger Valve
Tools Required:
3/8 inch Slotted Flat Blade Screwdriver
13/16 inch Open End Attachment on Torque Wrench
The defogger valve components are disassembled
as follows:
1) First, unscrew the lock nut and remove the spring,
control knob, and washer.
2) Next, unscrew the bonnet. Its o-ring will come
off with it. The valve stem, o-ring, and washer usu-
ally come out with the bonnet and can be pushed
out of the bonnet once removed from the side block.
3) If the stem remains in the side block body it can
be lifted out after the bonnet is removed.
5) The seat assembly can be unscrewed from the
side block body with the stem or a screwdriver.
7.5.3 Reassembly of the Defogger Valve
Tools Required:
3/8 inch Slotted Flat Blade Screwdriver
13/16" Open End Attachment on Torque Wrench
Minimum mandatory replacement parts during
overhaul:
Washers, o-rings
Side
block
© ⅯⅯⅩⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document #120614002
Seat
Valve
stem
Washer
Proper assembly of the defogger valve.
1) Screw in the new seat assembly until it is even
with the front of the side block body.
2) Next, install the new Teflon
o-ring onto the stem.
3) Insert the proper end of the stem into the seat as-
sembly and turn clockwise until the seat lightly bot-
toms out. Leave the stem in place.
4) Lubricate the new o-ring and install on the bon-
net.
O-ring
Washer
Kirby Morgan
washer and new
®
O-ring
Bonnet
Knob
Spring
Locknut
47
®
71
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