SuperLite
®
17B
© ⅯⅯⅩⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 120613005
69
7.4 Defogger Valve
7.4.1 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 control knob 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 usually
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.
4) The seat assembly can be unscrewed from the side
block body with the stem or a screwdriver.
7.4.2 Cleaning and Lubricating
1) Clean all the metal first in the soapy water solution
and then in a 50/50 dilute solution of white vinegar/
water. Rinse in fresh water.
2) Check the Nylon seat for wear and/or contamina
-
tion, and replace if necessary. Damage such as a rough
face or cuts to the seat indicate it must be replaced.
3) The Teflon
®
washer and O-ring must be replaced
if worn.
4) Be sure to place a light coating of proper lubricant
on all internal moving parts, O-rings, and washers.
However, do not lubricate the Nylon seat, as this will
attract dust and debris.
5) Inspect the seat area inside the side block and re
-
place the block if damaged.
Note: The procedures are the same for the “A” sideblock.
Remove the defogger control knob.
The seat should be removed for inspection.
The valve stem usually comes out with the bonnet.
Clean all the metal parts to remove salts.
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