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© ⅯⅯⅩⅢ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318002
Chapter 7 - Bent Tube Assembly
Kirby Morgan
®
37SS
Removing the bent tube.
7.7.3 Inspection of Bent Tube Assembly
Clean the bent tube in accordance with the cleaning
procedures in Chapter 6. The o-ring at the regulator
end should be cleaned and inspected whenever the
bent tube is removed.
Replace the o-ring on the bent tube if it is worn or damaged.
Replace the bent tube if it is excessively scratched
dented or compressed deeper than
1/8
inch. If the hel
-
met has been used for burning jobs, carefully check
for erosion of the metal or severe corrosion. Replace
if any erosion is present or integrity is in question.
Keep in mind the bent tube is a critical component
that routes breathing gas to the regulator system.
7.7.4 Reinstallation of the Bent Tube
Assembly
Tools Required:
11/16
inch Open-end Torque Wrench Attachment
Torque wrench
2 ea.
7/8
inch regulator adjustment wrenches
Normal minimum replacement parts during overhaul:
o-ring, Teflon
®
ring
If a new bent tube is being installed or the side block
has been removed, refer to the section on sideblock
replacement for installation instructions.
B
CAUTION
Use two wrenches or hold the hex
part of the body in a vise while remov-
ing or turning the seat with a wrench.
Do not use pliers on the main body of
the one-way valve. You may damage
the valve if pliers are used.
1) Lightly lubricate the bent tube o-ring and install
in the o-ring groove at the regulator end of the bent
tube, then install new Teflon
®
o-ring at the side block
end with the new ones supplied.
2) Push the o-ring end of the bent tube assembly
into the regulator nipple tube. Slide it in until the
side block end is aligned with the threads for the
mount nut.
3) Be sure the new Teflon
®
O-ring is in place on
the side block end of the bent tube then engage the
threads to the side block and hand tighten.
4) Start the “regulator to bent tube” mount nut onto
the nipple tube of the demand regulator and run it up
by hand as far as it will go. Use a wrench on the nipple
tube hex, if necessary, to prevent the nipple tube from
threading inward. If the nipple tube threads inward
this can damage the sealing surface of the inlet valve.
NOTE: Run the mount nut up on the inlet nipple
hand tight only.
5) Using a torque wrench, tighten the bent tube as
-
sembly nut onto the side block to (100 inch lbs).
