Auxiliary Gas Supply Valve Assembly; Disassembly Of The Auxiliary Valve Assembly; Cleaning And Lubricating - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

KMB 18 & 28 MANUAL
3) Insert the proper end of the stem (91) into the
seat assembly (92) and turn clockwise until the
seat (92) lightly bottoms out. Leave the stem in
place.
4) Lubricate the O-ring (88) and install on the
bonnet (87).
5) Slide the bonnet (87) over the stem (91) and
thread the bonnet (87) into the side block (94a/b).
6) Next, tighten the bonnet (87) until it has firmly
seated against the side block (94a/b) and torque
to the proper torque setting. (see torque specs, pg
89)
7) Place the washer (86) and control knob (85) on
the stem (91) and rotate the stem counterclock-
wise until the seat assembly (92) tops out fully
open, then turn clockwise until fully closed. The
control knob (85) must turn smoothly without
any binding. Binding (or "hard spots") in the
rotation could be an indication of a bent stem (91)
that should be replaced.
8) Install the washer (86), knob (85), spring (84),
and locknut (83). The locknut (83) must be run in
with a screwdriver until the threaded end of the
valve stem (91) is flush with the top of the locknut
or protrudes slightly. (Use your slotted screw-
driver for this step.)
6.7 AUXILIARY GAS SUPPLY VALVE
ASSEMBLY (103)
The auxiliary valve assembly (103) on the Kirby
Morgan Band Mask 18A/B and 28 is not built
into the side block (94a/b). It is a separate com-
ponent that can be removed and replaced, or
disassembled in place on the side block assembly
page 68
Fig. 6.37 Disassembly of the auxiliary valve.
© Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 010518001
(120a/b). This design differs from previous aux-
iliary valve designs in that it provides a higher
flow, but works on similar principles.
6.7.1 Disassembly of the Auxiliary Valve (103)
Assembly
Tools Required:
11/16 inch Open End Attachment on Torque
Wrench
3/8 inch Slotted Flat Blade Screwdriver
1 inch Open End Attachment on Torque Wrench
Soft jaw vice
1) Remove the locknut (102), spring (101), and
knob (100).
2) Undo the packing nut (99). When the packing
nut is free of the threads of the auxiliary valve
body (95), back out the stem (96) until it is free of
the auxiliary valve body (94).
3) Remove the packing nut (99), packing (98),
and washer (97) from the stem (96).

6.7.2 Cleaning and Lubricating

1) Clean all the metal parts in a dilute solution of
white vinegar. Rinse with fresh water.
2) Inspect the packing (98) and washer (97) for
wear and replace if necessary.
3) Inspect the stem (96) seat for unevenness or
wear and replace if necessary. It must also be
replaced if it is bent.