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Document XLDS Guide – Section Four A
Revised September 30, 2019
21
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
Check Valve / One Way Valve
Each regulator is attached to the manifold, via a
1/2" brass male pipe thread (MPT), one-way
valve. This same valve with a 1/2" elbow, can also
be installed on the manifolds, for use if an LP
supply is to be used. The one-way valves should
be disassembled, inspected, and cleaned, and the
sealing O-ring (5), at least every 5 years if the
console is being used with HP air only, and once a
year, if used with LP compressors, or whenever
the valve fails a sealing/leak test.
Overhaul of the valve is limited to cleaning the
body, spring and poppet, and replacing the O-ring
(5).
Tools and Materials Needed
7/16” Socket
5/8” Open End Wrench
7/8” Wrench (2)
Torque Wrench 0-250 inch lbs.
Torque Wrench Crows Foot Adapters
3/8” Socket Short
Christo Lube
O-Ring PN# 1XL25R
Brass Pick
Needle Nose Pliers
Flashlight
3” Diameter 12 Inch Long Piece of PVC Pipe
(used as a Regulator Holder)
¾”-1”Tube Brush
Preliminary
To remove the valve from the manifold and
regulator, the complete manifold system must be
unbolted from the foundation plate (1), and
removed from the console.
Ensure the work area and all tools are clean.
Ensure the gas supplies have been disconnected,
and all pressure has been vented. Open each
diver circuit
pneumofathometer valve, to ensure
the system is vented. The two and three diver
RDC units are disassembled, and reassembled in
the same manner, so this procedure will work for
both with only minor variation.
1. Loosen and remove the hose fittings on
Green, Red, and Yellow Diver
pneumofathometer valve (11).
(Same picture as the three way valve).
Figure 30
2.
Loosen and remove all the 7/16” lock nuts, from
each of the clamp blocks, then remove the blocks
and rubber strips. There are 8 blocks on the three
diver, and 5 blocks on the two diver consoles.
Figure 31
CAUTION
The threads that join the two halves of the one-
way valve body, should not be over-tightened.
The valve body haves, should be tightened to
between 100-120 inch lbs.
NOTICE
The valve body need not be removed, unless it is
severely corroded, contaminated or damaged. To
remove the body, use a 12 inch long piece of PVC
pipe 3” diameter, to hold the regulator body, and
a 7/8” open end wrench, to turn the one-way
valve body.