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XS Scuba Valves Service Manual
Annual Inspection and Pre-Test Prior
to Disassembly
NOTE: Prior to inspection, please note that
the XS Scuba K valve is designed with an “upset”
in the bottom of the o-ring groove. This allows air
to escape from behind the o-ring when removing
your regulator so that the o-ring doesn’t blow out
of the groove.
• Inspect the valve for bent, deformed, corroded or
worn parts.
• Check the exterior of the valve for damaged,
corroded or worn surfaces. This includes the
outlet, the valve body, handwheel and any visible
areas of the valve.
• Check for any contamination in the outlet of the
valve.
• Confirm that the service pressure of the valve and
safety assembly rating is correct for the cylinder
in which it is installed.
Leak Inspection Procedure
• Start with full working pressure in cylinder and
a properly functioning regulator attached to the
outlet.
• Open and close the valve while it is installed in the
cylinder and feel for smooth operation. If the valve
seems to be difficult to operate or any roughness
is felt, the valve must undergo full maintenance.
• Slowly open the valve fully.
• Remove handwheel from valve body by turning
handwheel screw in a counterclockwise direction
and remove handwheel. DO NOT REMOVE
BONNET NUT!
WARNING: Removing a bonnet nut(10) while
the valve is pressurized will result in a rapid and
violent release of air. This can lead to serious injury.
• Apply a non-ammonia soap and water solution
(or a recognized leak detection agent such as
“Snoop”), to the valve bonnet nut area, the inlet
neck o-ring area, the safety assembly area and the
outlet area.
• Allow the soap solution to sit for at least 15
seconds and check for signs of leakage. If
you find leaks, the valve MUST undergo full
maintenance.
• Turn the valve off. Purge and remove the regulator
from the valve. Apply the soap solution to the
valve outlet and check for leakage.
• If after performing all the items shown above
and finding no irregularities or leakage, the valve
may be returned to service. If any irregularities
or leakage is found, the valve must undergo full
maintenance.
Disassembly Procedure
1. Remove the Valve from the Cylinder
A. Drain the cylinder completely.
NOTE: Using an XS Scuba AC368 Tank
Muffler is a quick and quiet way to drain a scuba
cylinder.
B. Secure a large crescent wrench (at least 15 in.) to
the wrench flats at the base of the valve so that the
fixed jaw of the crescent wrench is on the far side of
the valve.
C. Hit the end of the crescent wrench handle with a
rubber mallet.
D. Spin out the valve.
2. Remove Inlet O-ring(3)
A. Using your fingers or a brass or plastic pick,
remove inlet (neck) o-ring(3).
